IMathAS-libretexts

Suppose that BC financial aid alots a textbook stipend by claiming that the average textbook at BC bookstore costs

\displaystyle \$

80.16. You want to test this claim.

The null and alternative hypothesis in symbols would be:

$\displaystyle {H}_{{0}}:\mu\ge{80.16}$
$\displaystyle {H}_{{1}}:\mu<{80.16}$
$\displaystyle {H}_{{0}}:\mu={80.16}$
$\displaystyle {H}_{{1}}:\mu≠{80.16}$
$\displaystyle {H}_{{0}}:{p}\le{80.16}$
$\displaystyle {H}_{{1}}:{p}>{80.16}$
$\displaystyle {H}_{{0}}:{p}\ge{80.16}$
$\displaystyle {H}_{{1}}:{p}<{80.16}$
$\displaystyle {H}_{{0}}:{p}={80.16}$
$\displaystyle {H}_{{1}}:{p}≠{80.16}$
$\displaystyle {H}_{{0}}:\mu\le{80.16}$
$\displaystyle {H}_{{1}}:\mu>{80.16}$

The null hypothesis in words would be:

The average of price of all textbooks from the store is less than $\displaystyle \$$ 80.16.
The average of price of all textbooks from the store is greater than $\displaystyle \$$ 80.16.
The average price of textbooks in a sample is $\displaystyle \$$ 80.16
The average price of all textbooks from the store is $\displaystyle \$$ 80.16
The proportion of all textbooks from the store that are less than 80.16 is equal to 50%

Based on a sample of 190 textbooks at the store, you find an average of 95.16 and a standard deviation of 28.2.

The point estimate is: (to 3 decimals)

The 99 % confidence interval (use z*) is: to (to 3 decimals)

Based on this we:

Reject the null hypothesis
Fail to reject the null hypothesis

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