solf club manufacturer claims that golfers can lower their scores by using the m

Question

solf club manufacturer claims that golfers can lower their scores by using the manufacturer's newly designed golf clubs. Eight golfers are randomly selected and each is asked to give his or her most recent score. After using the new clubs for one month, the golfers are asked again to give their most recent score. The scores for each golfer are given in the table below. is there enough evidence to support the manufacturer's claim? Let d golf score after using the newly designed golf clubs)-(golf score before using the newly designed golf clubs). Use a significance level of a 0.05 for the test. Assume that the scores are normally distributed for the population of golfers both before and after using the newly designed clubs Golfer Score (old design) 92 78 83 8083 95 82 76 Score (new design) 87 82 80 75 90 91 77 72 Copy Data Step 2 of S: Find the value of the standard deviation of the paired differences. Round your answer to one decimal place Answer How to enter your answer Subrnit Answer

Explanation / Answer

The data of paired differences will be:

5, -4, 3, 5, -7, 4, 5, 4

Hence,

Standard deviation

= stdev(5, -4, 3, 5, -7, 4, 5, 4) [Excel formula]

= 4.7

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