TESTS OF HYPOTHESIS: The amount of time students study per week was collected on

Question

TESTS OF HYPOTHESIS: The amount of time students study per week was collected on part of the original data set (n- 20 students) and STATISTIX was used to generate the test of hypothesis printout shown below. Use it to answer the following questions. It was desired to determine if the average amount of time students study per week exceeds 6.5 hours per week. One-Sample T Test Null Hypothesis: H-6.5 Alternative Hyp: ? 6.5 Variable Mean SE Study Time 7.5180 04811 2.20 19 0.0282 Cases Included 20 T DF P In addition to needing a random sample, what other assumption is necessary for the test to be valid The population of means needs to be approximately normally distributed The population of study times needs to be a t-distribution with (n-1) DF No other assumptions are needed . The population of study times needs to be approximately normally distributed. 9 4

Explanation / Answer

Sol:

For t test to apply

sample szie n<30

population standard deviation is not known

and follows noraml dsitribution.

here df=19

n=df+1=19+1=20

n<30

OPTION D

THE POPULATION OF STUDY TIMES NEEDS TO BE APPROXIMATELY NORMALLY DISTRIBUTED.

OPTION D

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