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Kamila [148]
3 years ago
10

A police officer claims that the proportion of drivers wearing a seat belt in a certain area is less than 40%. To test this clai

m, the officer collects a random sample of 80 drivers and monitors if the driver was wearing a seat belt. From this sample of 80 drivers, the police offers observes that 34 were wearing seat belts. Assume the conditions needed to conduct a one sample proportion test are satisfied. The setup for the null and alternative hypothesis is as follows: H0:p=0.40; Ha:p<0.40, which is a left-tailed test. The test statistic and p-value for this Hypothesis test are given as follows: z=0.456, p-value=0.676. Which of the following are appropriate conclusions for this hypothesis test? Select all that apply.
Mathematics
1 answer:
Lina20 [59]3 years ago
4 0

Answer:

Fail to reject the null because the p-value is greater than significance level (0.05). Therefore we have convincing evidence that the proportion of drivers wearing a seat belt is equal to 40%.

Step-by-step explanation:

I am assuming that the significance level is 0.05, so we would fail to reject the null, because the p-value is 0.676 which is greater than the significance level. Whenever the p-value is greater than the signifigance level we fail to reject the null.

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In a psychology class, 44 students have a mean score of 96.6 on a test. Then 13 more students take the test and their mean score
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Answer: 89.7

Step-by-step explanation:

The mean of a data set is the average of all the information given. Therefore, the total combined score is the number of students multiplied by the mean

The total score of the first 44 students: 96.6*44 = <em>4250.4</em>

The total score of the later 13 students: 66.3*13 = <em>861.9</em>

(4250.4 + 861.9)/(44 + 13) = 89.7

Hope this helped

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