Michael01

Record your answers and work. Problem Number Solution 1 Answer: (a) (ii) Density of people per square kilometer (b) (i) All countries in the world Justification for (a) and (b): (a): A variable is the measurement or observation of the individual(s). (b): The population is the set of values of the variable for the entire group of individuals. 2 Answer: (a) (ii) Nominal (b) (iii) Mode Justification for (a) and (b): (a): Since there are no numbers, no order to the data, and you cann...

1.) A doctor wishes to estimate the mean triglyceride level of patients two hours after eating a steak dinner. To estimate the mean, you collect data from 22 patients. State the individual, variable, population, sample, parameter, and statistic. Individual: The triglyceride level of patients two hours after eating a steak dinner. Population: Total number of patients. Sample: The 22 patients. Parameter: Population mean. Statistic: Sample mean. 2.) Explain why the relative frequency column...

Question 1 (0.5 points) A team of cognitive psychologists studying the effects of sleep deprivation on short-term memory decay had eight participants stay in a sleep lab for two days. Four participants were randomly assigned to a condition in which they were not permitted to sleep during that period, while the other four participants were allowed to sleep when they wanted to. At the end of the two days, the participants completed a short-term memory task that yielded the results in the tabl...

Table #10.1.6 contains the value of the house and the amount of rental income in a year that the house brings in (“Capital and rental,” 2013). Create a scatter plot and find a regression equation between house value and rental income. Then use the regression equation to find the rental income a house worth $230,000 and for a house worth $400,000. Which rental income that you calculated do you think is closer to the true rental income? Why? Table #10.1.6: Data of House Value versus Renta...

1. You choose an alpha level of .01 and then analyze your data. a. What is the probability that you will make a Type I error given that the null hypothesis is true? 1% b. What is the probability that you will make a Type I error given that the null hypothesis is false? 0% 2. True/false: It is easier to reject the null hypothesis if the researcher uses a smaller alpha (α) level. 3. Below are data showing the results of six subjects on a memory test. The three scores per subject are the...

1. Why is a 99% confidence interval wider than a 95% confidence interval? 99% confidence interval is only slightly wider. In order to have a higher degree of confidence you need to include a larger proportion of the population. 2. A person claims to be able to predict the outcome of flipping a coin. This person is correct 16/25 times. Compute the 95% confidence interval on the proportion of times this person can predict coin flips correctly. What conclusion can you draw about this test of...

1. Assume the speed of vehicles along a stretch of I-10 has an approximately normal distribution with a mean of 71 mph and a standard deviation of 8 mph. a. The current speed limit is 65 mph. What is the proportion of vehicles less than or equal to the speed limit? 65−71 8 =−0.75 P = 22.66x100 = .2266 b. What proportion of the vehicles would be going less than 50 mph? 50−71 8 =−2.625 P = 0.x100 = .0043 c. A new speed limit will be initiated such that approximately 10% of veh...

Problem 9: Which of the box plots on the graph has a large positive skew? Which has a large negative skew? Box plot B has a large positive skew and box plot C has a large negative skew. Positive skews have a long tail going either right or up where a negative skew has a large tail going to the left or down. Problem 6: You recorded the time in seconds it took for 8 participants to solve a puzzle. These times appear below. However, when the data was entered into the statistical program, the...

2.2.2 The median incomes of females in each state of the United States, including the District of Columbia and Puerto Rico, are given in table #2.2.10 ("Median income of," 2013). Create a frequency distribution, relative frequency distribution, and cumulative frequency distribution using 7 classes. Table #2.2.10: Data of Median Income for Females $31,862 $40,550 $36,048 $30,752 $41,817 $40,236 $47,476 $40,500 $60,332 $33,823 $35,438 $37,242 $31,238 $39,150 $34,023 $33,745 $33,269 $32,6...

1. (10 points) True or False. Justify your answers for full credit. (a) If all observations are identical in a data set, then the variance from this data set is zero. True: This is because the mean will be equal the values and no value will deviate from the mean. Therefore the variation or deviation from the mean will be equal to 0. (b) There may be more than one mode in a data set. Ture: Mode is the element with the highest frequency in a data set. (c) Suppose the minimum for a data set i...