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An advertisement claims that fast food breakfast sandwiches average less than 25 grams of fat. A sample of 15 sandwiches has a mean of 23.4 grams with a standard deviation of 9 grams. Using a significance level α =0.05 is there evidence to support the claim?
What is the test statistic for this test?



Answer :

The value of the test statistic of the given hypothesis testing is; -0.6885

How to find the test statistic of a normal distribution?

A test statistic is defined as a random variable that is calculated from sample data and used in a hypothesis test.

The formula for the test statistic here is;

z = (x' - μ)/(σ/√n)

where;

x' is sample mean

μ is population mean

σ is standard deviation

n is sample size

We are given;

Population mean; μ = 25

Sample mean; x' = 23.4

sample size; n = 15

standard deviation; s = 9

Thus;

z = (23.4 - 25)/(9/√15)

z = -0.6885

Read more about test statistic at; https://brainly.com/question/4621112

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