UCF QMB 3200 Final Exam
A organisation desires to become aware of which of the two manufacturing techniques has the
smaller crowning glory time. One pattern of people is chosen and every employee first uses one
technique after which makes use of the alternative method. The sampling technique being used
to accumulate of completion time records is based on - ANS-Matched samples.
A physician would like to realize if men and women got the equal quantity of sleep in line with
night time or if ladies tended to get less sleep than guys. He took a random sample of a hundred
of his male and 100 of his lady sufferers and requested them how many hours of sleep they
were given, in keeping with night, on average. The women slept a median of 6.75 hours and the
men slept a median of 7.5 hours. Suppose we additionally knew the populace preferred
deviations to be 1.25 hours and 1.5 hours for ladies and men, respectively. Formulate the null
and alternative hypotheses to test whether girls sleep much less than guys do, on common -
ANS-H0:: Um-Um=zero, Ha: Um-UW<0
A rapid meals eating place has automatic drink dispensers to help fill orders greater fast. When
the 12 ounce button is pressed, they would love for exactly 12 oz. Of beverage to be distributed.
There is, but, certainly a few variant on this quantity. The organisation does not want the
machine to systematically over fill or beneath fill the cups. Which of the subsequent offers the
precise set of hypotheses? - ANS-H0: u=12, Ha: u now not=12
A forecast model of the shape is known as a(n) - ANS-Quadratic trend equation.
A graph of the standardized residuals plotted towards values of the ordinary ratings that enables
to determine whether the idea that the mistake time period has a ordinary possibility distribution
seems to be legitimate is called a - ANS-Normal opportunity plot
A nearby entrepreneur would like to realize if folks who stay in a rural community are much
more likely to buy a actual Christmas tree than people who stay in an city community. He takes
a random pattern of a hundred individuals who are living in the town and a separate random
pattern of a hundred folks that live in the u . S . And asks them in the event that they purchase a
actual tree at Christmas time. Of the urban individuals, 22 purchase a actual tree. Of the
agricultural participants, 28 buy a real tree. Let P1= the proportion of everybody who live in rural
communities and buy a real Christmas tree, and allow P2 = the share of every body who live in
city groups and purchase a real Christmas tree. State the null and opportunity hypotheses. -
ANS-H0: p1-p2<0, Ha:p1-p2>0
A version in the form of , in which each unbiased variable zj (for j = 1, 2,..., p) is a characteristic
of x1, x2,..., xk, is known as the: - ANS-wellknown linear model.
A news reporter states that the average number of temperature in January has by no means
dropped below 10 degrees Fahrenheit. You go browsing to investigate this declare. The suitable
hypotheses are - ANS-H0: u>10, Ha: u<10.
A positive forecast error indicates that the forecasting method _____ the dependent variable. -
ANS-Underestimated.
A researcher recruits 25 people to participate in a study on alcohol consumption and its
interactions with Tylenol. The 25 participants had to come to a check-in center every day at 7:00
, a.M. For one week. They were given various amounts of alcohol. Each day, each participant
would flip a coin to determine if they also took Tylenol with their alcohol. They found that their
BAC was 25% higher on days when they were given Tylenol with their alcohol than when they
drank alcohol alone. This is an example of a(n) - ANS-matched sample design.
A sample of 92 observations is taken from an infinite population. The sampling distribution of is
approximately - ANS-normal because of the central limit theorem.
A seasonal pattern: - ANS-occurs when a time series plot exhibits a repeating pattern over
successive periods.
A simple random sample of size n from an infinite population is a sample selected such that -
ANS-each element is selected independently and is selected from the same population
A simple random sample of size n from an infinite population of size N is to be selected. Each
possible sample should have - ANS-the same probability of being selected
A statistics teacher started class one day by drawing the names of 10 students out of a hat and
asked them to do as many pushups as they could. The 10 randomly selected students averaged
15 pushups per person with a standard deviation of 9 pushups. Suppose the distribution of the
population of number of pushups that can be done is approximately normal. Which of the
following statements is true? - ANS-A t distribution should be used because σ is unknown.
A student wants to determine if pennies are really fair, meaning equally likely to land heads up
or tails up. He flips a random sample of 50 pennies and finds that 28 of them land heads up.
What are the appropriate null and alternative hypotheses? - ANS-H0: p=.5, Ha:p not =.5.
A time series from which the effect of season has been removed by dividing each original time
series observation by the corresponding seasonal index is called a: - ANS-deseasonalized time
series.
A time series method that is used to separate or decompose a time series into seasonal, trend,
and irregular components is called: - ANS-Time series decomposition.
A variable used to model the effect of categorical independent variables is called a(n) -
ANS-Dummy Variable
All of the following are true about qualitative forecasting methods except - ANS-they assume
that the pattern of the past will continue into the future.
All things held constant, which interval will be wider: a confidence interval or a prediction
interval? - ANS-Prediction interval
An approximate value of a population parameter that provides limits and believed to contain the
value of the parameter is known as - ANS-the interval estimate.
An F test, based on the F probability distribution, can be used to test for - ANS-Significance in
regression.
An observation that has a strong influence or effect on the regression results is called a(n) -
ANS-Influential observation.
Applications of hypothesis testing that only control for the Type I error are called -
ANS-significance tests.
As a rule of thumb, the sampling distribution of the sample proportion can be approximated by a
normal probability distribution when - ANS-n(1 - p) ≥ 5 and np ≥ 5.
As the number of degrees of freedom for a t distribution increases, the difference between the t
distribution and the standard normal distribution - ANS-becomes smaller.
As the sample size increases, the margin of error - ANS-decreases.
A organisation desires to become aware of which of the two manufacturing techniques has the
smaller crowning glory time. One pattern of people is chosen and every employee first uses one
technique after which makes use of the alternative method. The sampling technique being used
to accumulate of completion time records is based on - ANS-Matched samples.
A physician would like to realize if men and women got the equal quantity of sleep in line with
night time or if ladies tended to get less sleep than guys. He took a random sample of a hundred
of his male and 100 of his lady sufferers and requested them how many hours of sleep they
were given, in keeping with night, on average. The women slept a median of 6.75 hours and the
men slept a median of 7.5 hours. Suppose we additionally knew the populace preferred
deviations to be 1.25 hours and 1.5 hours for ladies and men, respectively. Formulate the null
and alternative hypotheses to test whether girls sleep much less than guys do, on common -
ANS-H0:: Um-Um=zero, Ha: Um-UW<0
A rapid meals eating place has automatic drink dispensers to help fill orders greater fast. When
the 12 ounce button is pressed, they would love for exactly 12 oz. Of beverage to be distributed.
There is, but, certainly a few variant on this quantity. The organisation does not want the
machine to systematically over fill or beneath fill the cups. Which of the subsequent offers the
precise set of hypotheses? - ANS-H0: u=12, Ha: u now not=12
A forecast model of the shape is known as a(n) - ANS-Quadratic trend equation.
A graph of the standardized residuals plotted towards values of the ordinary ratings that enables
to determine whether the idea that the mistake time period has a ordinary possibility distribution
seems to be legitimate is called a - ANS-Normal opportunity plot
A nearby entrepreneur would like to realize if folks who stay in a rural community are much
more likely to buy a actual Christmas tree than people who stay in an city community. He takes
a random pattern of a hundred individuals who are living in the town and a separate random
pattern of a hundred folks that live in the u . S . And asks them in the event that they purchase a
actual tree at Christmas time. Of the urban individuals, 22 purchase a actual tree. Of the
agricultural participants, 28 buy a real tree. Let P1= the proportion of everybody who live in rural
communities and buy a real Christmas tree, and allow P2 = the share of every body who live in
city groups and purchase a real Christmas tree. State the null and opportunity hypotheses. -
ANS-H0: p1-p2<0, Ha:p1-p2>0
A version in the form of , in which each unbiased variable zj (for j = 1, 2,..., p) is a characteristic
of x1, x2,..., xk, is known as the: - ANS-wellknown linear model.
A news reporter states that the average number of temperature in January has by no means
dropped below 10 degrees Fahrenheit. You go browsing to investigate this declare. The suitable
hypotheses are - ANS-H0: u>10, Ha: u<10.
A positive forecast error indicates that the forecasting method _____ the dependent variable. -
ANS-Underestimated.
A researcher recruits 25 people to participate in a study on alcohol consumption and its
interactions with Tylenol. The 25 participants had to come to a check-in center every day at 7:00
, a.M. For one week. They were given various amounts of alcohol. Each day, each participant
would flip a coin to determine if they also took Tylenol with their alcohol. They found that their
BAC was 25% higher on days when they were given Tylenol with their alcohol than when they
drank alcohol alone. This is an example of a(n) - ANS-matched sample design.
A sample of 92 observations is taken from an infinite population. The sampling distribution of is
approximately - ANS-normal because of the central limit theorem.
A seasonal pattern: - ANS-occurs when a time series plot exhibits a repeating pattern over
successive periods.
A simple random sample of size n from an infinite population is a sample selected such that -
ANS-each element is selected independently and is selected from the same population
A simple random sample of size n from an infinite population of size N is to be selected. Each
possible sample should have - ANS-the same probability of being selected
A statistics teacher started class one day by drawing the names of 10 students out of a hat and
asked them to do as many pushups as they could. The 10 randomly selected students averaged
15 pushups per person with a standard deviation of 9 pushups. Suppose the distribution of the
population of number of pushups that can be done is approximately normal. Which of the
following statements is true? - ANS-A t distribution should be used because σ is unknown.
A student wants to determine if pennies are really fair, meaning equally likely to land heads up
or tails up. He flips a random sample of 50 pennies and finds that 28 of them land heads up.
What are the appropriate null and alternative hypotheses? - ANS-H0: p=.5, Ha:p not =.5.
A time series from which the effect of season has been removed by dividing each original time
series observation by the corresponding seasonal index is called a: - ANS-deseasonalized time
series.
A time series method that is used to separate or decompose a time series into seasonal, trend,
and irregular components is called: - ANS-Time series decomposition.
A variable used to model the effect of categorical independent variables is called a(n) -
ANS-Dummy Variable
All of the following are true about qualitative forecasting methods except - ANS-they assume
that the pattern of the past will continue into the future.
All things held constant, which interval will be wider: a confidence interval or a prediction
interval? - ANS-Prediction interval
An approximate value of a population parameter that provides limits and believed to contain the
value of the parameter is known as - ANS-the interval estimate.
An F test, based on the F probability distribution, can be used to test for - ANS-Significance in
regression.
An observation that has a strong influence or effect on the regression results is called a(n) -
ANS-Influential observation.
Applications of hypothesis testing that only control for the Type I error are called -
ANS-significance tests.
As a rule of thumb, the sampling distribution of the sample proportion can be approximated by a
normal probability distribution when - ANS-n(1 - p) ≥ 5 and np ≥ 5.
As the number of degrees of freedom for a t distribution increases, the difference between the t
distribution and the standard normal distribution - ANS-becomes smaller.
As the sample size increases, the margin of error - ANS-decreases.
