This scenario will be used for questions 5-13. A newspaper article says that the

Question

This scenario will be used for questions 5-13. A newspaper article says that the average amount Believing this number is too high, Dr. Bosley's stat class surveys 25 studen They se asignance level (a)of 5% wiich of the following is an approprate null hypothesis for their test? of spending money per week of college students is at least $42 ts about their weekly spending money. They find a mean of $40.15 and a standard deviation of 3.33 Select one a The average amount of spending money per week of college students is $42 or more. O O O b. The average amount of spending money per week of college students is less than $42 c. The average amount of spending money per week of college students is not $42 d. The average amount of spending money per week of college students is more than $42 Using the scenario from question 5, should they use a Zatle araae?

Explanation / Answer

5) Null hypothesis should defend the case. Here they are expecting expense should not be more than 42$

Thus, correct null hypothesis would be Option 2

The average amount of spending money per week of college students is less than $42

8) As our null hypothesis is money spend < $42

it should be rejected when money spend > $42

Thus, it is right tailed test with rejection region in right tails only (option 4)

9) That is correct

Degrees of freedom = n-1 = 25-1 =24

for question 7) and 10) value of standard deviation is not visible in question 5.

We can use the standard formula for right tailed t test and calculate the answers

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