YouTube would like to test the hypothesis that the standard deviation for the length of an online video watched by a user is more than 2 minutes. A random sample of 21 people who watched online videos was selected.
The sample standard deviation for the length of the video was found to be 2.5 minutes. Using = 0.10, the critical value for this hypothesis test would be ________.A) 12.443
B) 28.412
C) 29.615
D) 30.813
Q. 2A random sample of 60 business students required an average of 50.7 minutes to complete a statistics exam. Assume that the population standard deviation to complete the exam was 10.4 minutes.
The standard error of the mean for this sample is ________.A) 0.63
B) 1.07
C) 1.34
D) 2.30
Q. 3Consider the partially completed randomized block ANOVA summary table.
Source Sum of
Squares Degrees of
Freedom Mean Sum of
Squares
F
Between 600 3
Block 5
Error 750
Total 2,150 23
Using = 0.05, the conclusion for this ANOVA procedure would be that because the main factor test statistic is _____________________________
_____________________________
______.
A) more than the critical value, we cannot reject the null hypothesis and conclude that there is a difference in population means
B) less than the critical value, we can reject the null hypothesis and conclude that there is no difference in population means
C) less than the critical value, we cannot reject the null hypothesis and conclude that there is a difference in population means
D) more than the critical value, we can reject the null hypothesis and conclude that there is a difference in population means
Q. 4A ________ component is present in a time series if a consistent pattern in the data can be associated with a calendar.
A) cyclical
B) seasonal
C) random
D) trend
Q. 5Suppose the average math SAT score for students enrolled at Madison College is 507.3 with a standard deviation of 68.2. A random sample of 43 students has been selected. The standard error of the mean for this sample is ________.
A) 7.1
B) 10.4
C) 38.4
D) 68.2
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