Statistics Milestone 5 Exam / Questions with
Certified Solutions.
Edwin conducted a survey to find the percentage of people in an area who
smoked regularly. He defined the label "smoking regularly" for males smoking 30
or more cigarettes in a day and for females smoking 20 or more. Out of 635
persons who took part in the survey, 71 are labeled as people who smoke
regularly.
What is the standard error for the sample proportion? Answer choices are
rounded to the thousandths place. - Answer: 0.013
For a left-tailed test, the critical value of z so that a hypothesis test would reject
the null hypothesis at 1% significance level would be __________. Answer choices
are rounded to the hundredths place. - Answer: -2.33
Page 1 of 7
, A market research company conducted a survey to find the level of affluence in a
city. They defined the category "affluence" for people earning $100,000 or more
annually. Out of 267 persons who replied to their survey, 32 are considered
affluent.
What is the 95% confidence interval for this population proportion? Answer
choices are rounded to the hundredths place. - Answer: 0.08 to 0.16
Adam tabulated the values for the average speeds on each day of his road trip as
60.5, 63.2, 54.7, 51.6, 72.3, 70.7, 67.2, and 65.4 mph. He wishes to construct a
98% confidence interval.
What value of t* should Adam use to construct the confidence interval? Answer
choices are rounded to the thousandths place. - Answer: 2.998
A ball is drawn from a bag of 26 red and 12 yellow balls. The process is repeated
50 times, replacing each ball that is drawn.
Which of the following statements about the distributions of counts and
proportions is TRUE? - Answer: The count of drawing a red ball is a binomial
distribution.
Ryan, a baker, measured the weights of cakes baked in each batch at his bakery
and found that the mean weight of each cake is 500 grams. He performed a
hypothesis test to find the mean weight of each cake by setting H₀ = 500 and Hₐ <
500.
Select the statement that indicates a Type I error. - Answer: Rejecting the mean
weight of each cake as 500 grams when H₀ = 500.
Page 2 of 7
Certified Solutions.
Edwin conducted a survey to find the percentage of people in an area who
smoked regularly. He defined the label "smoking regularly" for males smoking 30
or more cigarettes in a day and for females smoking 20 or more. Out of 635
persons who took part in the survey, 71 are labeled as people who smoke
regularly.
What is the standard error for the sample proportion? Answer choices are
rounded to the thousandths place. - Answer: 0.013
For a left-tailed test, the critical value of z so that a hypothesis test would reject
the null hypothesis at 1% significance level would be __________. Answer choices
are rounded to the hundredths place. - Answer: -2.33
Page 1 of 7
, A market research company conducted a survey to find the level of affluence in a
city. They defined the category "affluence" for people earning $100,000 or more
annually. Out of 267 persons who replied to their survey, 32 are considered
affluent.
What is the 95% confidence interval for this population proportion? Answer
choices are rounded to the hundredths place. - Answer: 0.08 to 0.16
Adam tabulated the values for the average speeds on each day of his road trip as
60.5, 63.2, 54.7, 51.6, 72.3, 70.7, 67.2, and 65.4 mph. He wishes to construct a
98% confidence interval.
What value of t* should Adam use to construct the confidence interval? Answer
choices are rounded to the thousandths place. - Answer: 2.998
A ball is drawn from a bag of 26 red and 12 yellow balls. The process is repeated
50 times, replacing each ball that is drawn.
Which of the following statements about the distributions of counts and
proportions is TRUE? - Answer: The count of drawing a red ball is a binomial
distribution.
Ryan, a baker, measured the weights of cakes baked in each batch at his bakery
and found that the mean weight of each cake is 500 grams. He performed a
hypothesis test to find the mean weight of each cake by setting H₀ = 500 and Hₐ <
500.
Select the statement that indicates a Type I error. - Answer: Rejecting the mean
weight of each cake as 500 grams when H₀ = 500.
Page 2 of 7
