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3241004551 [841]
3 years ago
14

The owner of a shoe store wanted to determine whether the average customer bought more than $100 worth of shoes. She randomly se

lected 10 receipts and identified the total spent by each customer. The totals (rounded to the nearest dollar) are given below.
Use a TI-83, TI-83 Plus, or TI-84 calculator to test whether the mean is greater than $100 and then draw a conclusion in the context of the problem. Use α=0.05.
125 99 219 65 109 89 79 119 95 135
Select the correct answer below:
A) Reject the null hypothesis. There is sufficient evidence to conclude that the mean is greater than $100.
B) Reject the null hypothesis. There is insufficient evidence to conclude that the mean is greater than $100.
C) Fail to reject the null hypothesis. There is sufficient evidence to conclude that the mean is greater than $100.
D) Fail to reject the null hypothesis. There is insufficient evidence to conclude that the mean is greater than $100.
Mathematics
1 answer:
vladimir2022 [97]3 years ago
8 0

Answer:

D) Fail to reject the null hypothesis. There is insufficient evidence to conclude that the mean is greater than $100.

Step-by-step explanation:

We are given that the owner of a shoe store randomly selected 10 receipts and identified the total spent by each customer. The totals (rounded to the nearest dollar) are given below;

X: 125, 99, 219, 65, 109, 89, 79, 119, 95, 135.

Let \mu = <u><em>average customer bought worth of shoes</em></u>.

So, Null Hypothesis, H_0 : \mu \leq $100      {means that the mean is smaller than or equal to $100}

Alternate Hypothesis, H_A : \mu > $100      {means that the mean is greater than $100}

The test statistics that will be used here is <u>One-sample t-test statistics</u> because we don't know about population standard deviation;

                            T.S.  =  \frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }  ~ t_n_-_1

where, \bar X = sample mean = \frac{\sum X}{n} = $113.4

             s = sample standard deviation = \sqrt{\frac{\sum (X-\bar X)^{2} }{n-1} } = $42.78

             n = sample of receipts = 10

So, <u><em>the test statistics</em></u> =  \frac{113.4-100}{\frac{42.78}{\sqrt{10} } }  ~  t_9

                                    =  0.991

The value of t-test statistics is 0.991.

Now, at a 0.05 level of significance, the t table gives a critical value of 1.833 at 9 degrees of freedom for the right-tailed test.

Since the value of our test statistics is less than the critical value of t as 0.991 < 1.833, so <u><em>we have insufficient evidence to reject our null hypothesis</em></u> as it will not fall in the rejection region.

Therefore, we conclude that the mean is smaller than or equal to $100.

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