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Number 5 Please, Explain shortcut with TI84 if applicable

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Step 1

Given claim that average age of scion driver = 26

Null hypothesis H0 : µ = 26
Alternative hypothesis  Ha : µ ≠ 26

Given
Sample size = 18
Sample mean = 27.5
Standard deviation = 2.3
Since the population standard deviation is given we use the Z distribution to find the confidence interval.

For 95% confidence interval alpha = level of significance = 0.05

First in Ti-84
First select STAT and the select TESTS ad selectthe Z-interval (option 7)
Under INput select STATS  as we know all statistics to calculate the cofidence interval.
Enter
population standard deviation σ = 2.3
sample mean xbar = 27.5
sample size n = 12
C.level = 0.95 (since we need 95% confidence interval) and then highlight calculate and press enter.

The 95% confidence interval for average age of scion driver is (26.44, 28.56)

Step 2

Toyota claim is that average age of scion driver is 26 years. But the 95% confidence interval is from (26.44 , 28.56) whi...

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