Question

A study claims that on average 24 people buys cigarettes per day. 150 people are selectedd and tested. The sample mean is 29 and the sample standard deviation is 2.3. Evaluate the claim using a P-value.

Answer 1

given data are:-

hypothesis:-

[ claim ]

the test statistic be:-

df = (n-1) = (150-1) = 149

the p value = 0.0000

[ in any blank cell of excel type =T.DIST.2T(26.6249,149)]

decision:-

p value = 0.0000 < 0.05 (alpha)

we reject the null hypothesis and conclude that there is not enough evidence to support the claim that on average 24 people buys cigarettes per day .

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