confidence intervals for means

confidence intervals for means

9th - 12th Grade

6 Qs

quiz-placeholder

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confidence intervals for means

confidence intervals for means

Assessment

Quiz

Mathematics

9th - 12th Grade

Medium

CCSS
HSS.IC.B.4, HSS.IC.A.1, HSS.ID.A.4

Standards-aligned

Created by

Alaina Johnson

Used 11+ times

FREE Resource

6 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

An IQ test was given to a simple random sample of 75 students at a certain college. The sample mean score was 105.2. Scores on this test are known to have a standard deviation of 10. It is desired to construct a 90% confidence interval for the mean IQ scores of the students at the college.


What is the point estimate?

75

105.2

10

0.90

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

2.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the margin of error for the interval (6.8, 12.9)?

9.85

3.05

3.50

6.8

Tags

CCSS.HSS.IC.B.4

3.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A 90% confidence interval for the average salary of all CEOs in the electronics industry was constructed using the results of a random survey of 45 CEOs. The interval was $139,048 to $154,144. Give the interpretation of the interval.

90% of the sampled CEOs have salaries that fell in the interval $139,048 to $154,144

We are 90% confident that the mean salary of all CEOs in the electronics industry falls in the interval $139,048 to $154,144.

There is a 90% chance that CEOs in the electronics industry have salaries that fall between $139,048 to $154,144

We are 90% confident that the mean salary of the sampled CEOs falls in the interval $139,048 to $154,144.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

CCSS.HSS.ID.A.4

4.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A 90% confidence interval for the mean speed driven by cars on Due West Road is given by (21, 45). What was the sample mean of this study?

12

24

33

None of these.

Tags

CCSS.HSS.IC.B.4

5.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

The lifetime of a certain type of battery is known to be normally distributed with a standard deviation of 20 hours. A sample of 50 batteries had a mean lifetime of 120.1 hours. It is desired to construct a 99% confidence interval for the mean lifetime of this type of battery.


What is the Confidence Interval to one decimal place?

(114.5, 125.6)

(112.8, 127.4)

(112.82, 127.38)

(114.56, 125.64)

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

CCSS.HSS.ID.A.4

6.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

An IQ test was given to a simple random sample of 75 students at a certain college. The sample mean score was 105.2. Scores on this test are known to have a standard deviation of 10. It is desired to construct a 90% confidence interval for the mean IQ scores of the students at the college.


Calculate the confidence interval.

101 to 104

100 to 105

99.5 to 105

98.7 to 106

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.4

CCSS.HSS.ID.A.4