Answer:
A
Step-by-step explanation:
Answer:
The books cost $28 dollars each.
Step-by-step explanation:
$266 - $14 = $252
then take $252 divided by 9 = $ 28
Answer:
52.5
Step-by-step explanation:
Answer:
c) t-test of population mean
Explanation:
The t-test statistic is used in hypothesis testing. Here we would use a one sample t test to test our hypothesis. The one sample t test measures the statistical difference between the hypothesized mean and the sample mean. In a one sample t test or single sample t test, a test variable is measured against a test value.
Example we compare our test variable to the hypothesized mean value $75 above.
The t test is used instead of z score when standard deviation is unknown.
Using the t test, we either accept or reject the null hypothesis given alternative hypothesis.
