Analia is a school district manager. Here are some details about two schools in her district for the last school year:

Mathematics

1 answer:

seraphim [82]3 years ago

5 0

It’s b I hope that helps

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When a softball player gets a hit, it can be a single, double, triple, or home run. When Josephine is at bat, the probability th

sergiy2304 [10]

The key word here is "or". If it's an OR question, you add the probabilities together. If it says "and", you multiply them together
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So:
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3 years ago

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A student records the repair cost for 22 randomly selected dryers. A sample mean of $98.78 and standard deviation of $15.49 are

Gelneren [198K]

Answer:

The critical value that should be used is T = 2.0796.

The 95% confidence interval for the mean repair cost for the dryers is between $91.912 and $105.648.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 22 - 1 = 21

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 21 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.95}{2} = 0.975$ . So we have T = 2.0796, which is the critical value that should be used.