# A political analyst believes that a senator's recent decision to support a bill resulted in a drop of approval ratings. To test thisclaim, he selects random cities in the state that voted the senator in and compares the approval ratings before the decisionto the approval ratings after the decision. If we let d approval rating after - approval rating before, based on thedata below, what are the test statistic and degrees of freedom of an appropriate hypothesis test? Assume that the approvalratings are normally distributed. Round the test statistic to three decimal places.Approval Rating Before(percent)Approval Rating After(percent)56.258.954.752.152.149.650.249.354.154.350.748.661.254.746.149.6Provide your answer below:,df =

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A political analyst believes that a senator's recent decision to support a bill resulted in a drop of approval ratings. To test this claim, he selects random cities in the state that voted the senator in and compares the approval ratings before the decision to the approval ratings after the decision. If we let d=approval rating after−approval rating before, based on the data below, what are the test statistic and degrees of freedom of an appropriate hypothesis test? Assume that the approval ratings are normally distributed. Round the test statistic to three decimal places.

 Approval Rating Before (percent) Approval Rating After (percent) 58.9 56.2 54.7 52.1 52.1 49.6 50.2 49.3 54.3 54.1 50.7 48.6 61.2 54.7 49.6 46.1

t=    , df=
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Step 1

Paired t-test:

To test whether senator’s recent decision support a bill resulted in a drop of approval ratings, the test statistic is given by,

Step 2

Computation of test statistic t:

Step-by-step procedure to perform paired t-test using EXCEL:

• Go to Data > Data Analysis.
• In Analysis Tool, choose t-Test: Paired Two Sampl...

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