YouTube would like to test the hypothesis that the average length of an online video watched by a ...

YouTube would like to test the hypothesis that the average length of an online video watched by a user is more than 8 minutes. A random sample of 37 people watched online videos that averaged 8.7 minutes in length.
 
  It is believed that the population standard deviation for the length of online videos is 2.5 minutes. YouTube would like to set  = 0.02. The critical value for this hypothesis test would be ________.A) 2.05
  B) 1.96
  C) 1.645
  D) 1.28

Q. 2

The sample correlation coefficient can be equal to any value __________
 
  A) between 1.0 and +1.0.
  B) greater than or equal to zero.
  C) other than zero.
  D) between and .

Q. 3

The p-value for a hypothesis test is defined as the probability of observing a____________________________ _______________________.
 
  A) critical value at least as extreme as the one selected for the hypothesis test, assuming the null hypothesis is true
  B) critical value at least as extreme as the one selected for the hypothesis test, assuming the null hypothesis is false
  C) sample mean at least as extreme as the one selected for the hypothesis test, assuming the null hypothesis is true
  D) population mean at least as extreme as the one selected for the hypothesis test, assuming the alternative hypothesis is true

Q. 4

The advantage of using the Tukey-Kramer multiple comparisons procedure is that the probability of making a Type I error applies to all possible combinations of sample pairs.
 
  Indicate whether the statement is true or false

Q. 5

During the 3 PM to 5 PM time period, cars arrive at a bank's drive-through window at an average rate of 15 customers per hour. Assume that the time between arrivals follows the exponential distribution.
 
  What is the probability that a randomly selected customer will arrive more than 10 minutes after the previous customer?A) 0.0821
  B) 0.1515
  C) 0.2732
  D) 0.3670

Q. 6

The Canadian government would like to test the hypothesis that the average hourly wage for men is more than 2.00 higher than the average hourly wage for women. The following data summarizes the sample statistics for hourly wages for men and women.
 
  Assume that the population variances are equal. Men WomenSample mean 25.40 21.20Sample size 20 18Sample standard deviation 6.20 5.90If Population 1 is defined as men and Population 2 is defined as women, the degrees of freedom for this hypothesis test are ________.A) 34
  B) 35
  C) 36
  D) 38