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9.2.6-T Suppose the coffee industry claimed that the average adult drinks 1.8 cups of coffee per...

9.2.6-T

Suppose the coffee industry claimed that the average adult drinks 1.8 cups of coffee per day. To test this​ claim, a random sample of 40 adults was​ selected, and their average coffee consumption was found to be 1.95 cups per day. Assume the standard deviation of daily coffee consumption per day is 0.4 cups. Using alpha equals0.05 ,complete parts a and b below.

a. Is the coffee​ industry's claim supported by this​ sample?

Determine the null and alternative hypotheses.

Upper H 0 ​:mu

▼

less than or equals

greater than

not equals

less than

equals

greater than or equals

nothing

Upper H 1 ​: mu

▼

not equals

less than

greater than

greater than or equals

equals

less than or equals

nothing

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Answer #1

Let mu denotes the average daily coffee consumption per day.

To test whether the coffee​ industry's claim supported by this​ sample,

i.e. to test null hypothesis H0 : μ = 1.8 against alternative hypothesis H_1:mu eq 1.8

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