Question

The average work week for engineers in a start-up company is believed to be about 60 hours. A newly hired engineer hopes that it's shorter. She asks 10 engineering friends in start-ups for the lengths of their average work weeks. Based on the results that follow, should she count on the average work week to be shorter than 60 hours? Conduct a hypothesis test at the 5% level.

Data (length of average work week): 70; 45; 55; 60; 65; 60; 60; 60; 55; 55.

Construct a 95% confidence interval for the true mean. Sketch the
graph of the situation. Label the point estimate and the lower and
upper bounds of the confidence interval. (Round your lower and
upper bounds to two decimal places.)

I already know that the point estimate is 58.50 for sure. I already got that right.

No matter how I calculate it, I cannot get the intervals, I asked a question like this previously here, I got a reply, but the answer was wrong.

I need to know how to do it on a TI 84 plus

Answer #1

We have to find a 95% confidence interval for the true mean by using TI 84 calculator.

First, enter data into the calculator.

Click on STAT ------> Edit -------->Enter values into L1

Then click on STAT -------> TESTS --------->TInterval( ----------> Data --------->

List: L1

Freq: 1

C-Level: 0.95

Calculate

We get a confidence interval **(53.716,
63.284)**

-----------------------------------------------------------------------------------------------

If you have any doubt please comment!

The mean work week for engineers in a start-up company is believed
to be about 60 hours. A newly hired engineer hopes that it's
shorter. She asks 10 engineering friends in start-ups for the
lengths of their mean work weeks. Based on the results that follow,
should she count on the mean work week to be shorter than 60 hours?
Conduct a hypothesis test at the 5% level.
Data (length of average work week): 70; 50; 55; 65; 65; 55;...

The mean work week for engineers in a start-up company is
believed to be about 62 hours. A newly hired engineer hopes that
it’s shorter. She asks ten engineering friends in start-ups for the
lengths of their mean work weeks. Based on the results that follow,
should she conclude at the 5% significance level that the mean work
week is shorter than 62 hours?Data (length of mean work week): 70;
50; 55; 60; 65; 55; 55; 60; 50; 55.

Using TI 83 Calculator Only
Show All Steps
1. The average work week for engineers in a start-up company
is believed to be about 60 hours. A newly hired engineer hopes that
it’s shorter. She asks 10 engineering friends in start-ups for the
lengths of their average work weeks. Based on the results that
follow, should she count on the
average work week to be shorter than 60 hours?
Data (length of average work week): 70; 45; 55; 60; 65;...

Hi, I would like to know how to solve this stats question using
only Excel.
The mean work week for engineers in a start-up company is
believed to be about 60 hours. A newly hired engineer hopes that
it’s shorter. She asks ten engineering friends in start-ups for the
lengths of their mean work weeks. Based on the results that follow,
should she count on the mean work week to be shorter than 60
hours?
Data (length of mean work...

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