Question

Using TI 83 Calculator Only

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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; 55;
55; 60; 50; 55.

2. A poll done for Newsweek found that 13% of Americans have
seen or sensed the presence of an

angel. A contingent doubts that the percent is really that
high. It conducts its own survey. Out of 76 Americans surveyed,
only 2 had seen or sensed the presence of an angel. As a result of
the continent's survey, would you agree with the Newsweek poll? In
complete sentences, also give three reasons why the two polls might
give different results.

Answer #1

1)

Claim: The average workweek to be shorter than 60 hours

The null and alternative hypothesis is

Level of significance = 0.05

By using the TI-84 calculator we have to solve this question.

First, enter data in TI-84 calculator.

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

Then click on STAT ------> TESTS -------> T-Test -------> Data -------->

: 60

List: L1

Freq: 1

Calculate

We get

Test statistic t = - 1.33

P-value = 0.1086

P-value > 0.05 we fail to reject null hypothesis.

Conclusion:

The average workweek not shorter than 60 hours

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

For the next question please repost!

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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...

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;...

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