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Homework 7.7

Authored by Kristen Cipresso

Mathematics

9th - 12th Grade

Used 1+ times

Homework 7.7
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5 questions

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1.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

Margin of Error is equal to:

Standard Deviation

2 * Standard Deviation

Critical Value

Point Estimate

2.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

A school claims that the average English regents’ score of its students is at most 80. You sample 16 students and find that the sample mean is 78 and the sample standard deviation is 12.

The school took a sample with the above results and want to construct a two-sided 95% confidence interval for the population mean. The lower limit of the confidence interval is:

54

66

90

102

3.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

A concert promoter wants to estimate the average age of the 30,500 people attending a Drake concert. At the concert, 95 people are randomly selected. The average age of the 95 people is 21.8 with a standard deviation of 9.2. Based on this data, using a 95% confidence interval, the confidence interval at the concert is:

Between 3.6 and 35.5

Between 12.6 and 31

Between 3.4 and 40.2

Between 9.2 and 21.8

4.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

The physical therapist conducts an observational study of 200 swimmers and the lengths of time they can hold their breath underwater. The average amount of time they can hold their breath is 75 seconds with a standard deviation of 7.2. Based on this data, using a 95% confidence interval, what is the interval for the sample?

0 - 60.6

60.6 - 89.4

89.4 - 100

60.6 - 100

5.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

A scientist is collecting a random sample of the weight of sharks. The sample mean weight is 300 pounds with a standard deviation of 15. The scientist took the above results and wants to construct a two-sided 95% confidence interval for the population mean. The higher limit of the confidence interval is:

270

300

315

330

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