The MBA program at Dover College has an enrollment of 160 students with an average age of 34.7 years old and a standard deviation 5.2 years. A random sample of 40 MBA students was selected.
What is the probability that the average age of the sample is less than 34 years old?A) 0.4443
B) 0.3300
C) 0.2946
D) 0.1635
Q. 2The critical z-score for a 98 confidence level is ________.
A) 1.28
B) 1.96
C) 2.33
D) 2.575
Q. 3The test statistic for the Wilcoxon rank-sum test equals the sum of the ranks for the sample with the larger sample size. If the sample sizes are equal, either sample can be used to calculate the test statistic.
Indicate whether the statement is true or false
Q. 4According to comScore, Facebook users spent an average of 432 minutes on the site during a recent month. Assume that this population has a standard deviation of 127 minutes. A random sample of 50 users was selected from this population.
What is the probability that the average number of minutes on the site in January was less than 410 minutes?A) 0.0643
B) 0.1112
C) 0.2806
D) 0.3384
Q. 5Recently, the average amount of time to foreclose on a house in the U.S. was reported to be 359 days. Assume that the standard deviation for this population is 90.4 days.
A random sample of 42 homes that have completed the foreclosure process was selected. What is the probability that the sample average was less than 375 days?A) 0.5129
B) 0.6350
C) 0.7264
D) 0.8749
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