cigarette smoking- a reasearcher found that a cigarette smoker smokes on average 31 cigarettes a day. She feels that this average is too high . she selected a random sample of 10 smokers and found that the mean number of cigarettes smoked per day  was 28. the sample standard deviation was at 2.7. at a=0.05 is there enough evidence to support her claim?   please explain step by step and also can you show me how your getting d.f.?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 26PFA
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cigarette smoking- a reasearcher found that a cigarette smoker smokes on average 31 cigarettes a day. She feels that this average is too high . she selected a random sample of 10 smokers and found that the mean number of cigarettes smoked per day  was 28. the sample standard deviation was at 2.7. at a=0.05 is there enough evidence to support her claim?

 

please explain step by step and also can you show me how your getting d.f.?

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