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Chapter 9 vocab review

Total questions: 13

Worksheet time: 18mins

Name
Class
Date
1.

A random sample of 100 Woodrow students found that 53 of them were in possession of a pencil. What is the p-hat for this sample?

a)

0.53

b)

0.5

c)

53

d)

153

2.
Which z-value is used for a 95% confidence interval?
a)
1.65
b)
1.96
c)
2.58
d)
2.33
3.
A sample of 30 women finds the mean height to be 62.3 in and the standard deviation to be 1.5 in. Find the margin of error of women's heights with a 95% CL.
a)
1.699
b)
0.56
c)
0.537
d)
19.325
4.
The 90% interval for a statistics test was given by 72 +- 7. What is the lower bound for the interval?
a)
7
b)
72
c)
65
d)
79
5.
In a crash test of 15 troopers, collision repair costs are found to have a distribution that is approximately normal, with a mean of $1800 and a standard deviation of $950. Construct a 99% confidence interval for the repair cost. 
a)
(1070, 2530)
b)
(1273, 2326)
c)
(1799, 1801)
d)
None of these.
6.
Thirty randomly selected students took the calculus final. If the sample mean was 92 and the standard deviation was 9.4, construct a 99 percent confidence interval for the mean score of all students.
a)
89.08 < μ < 94.92 
b)
87.27 < μ < 96.73
c)
87.29 < μ < 96.71 
d)
87.77 < μ < 96.23
7.

If 827 represents "no" voters out of 2584, construct a 95% confidence interval for the "no" group.

a)

[.662,.698]

b)

[.298,.342]

c)

[.302,.338]

d)

[.288,.352]

8.
In a survey of 2480 golfers, 15% said they were left-handed.  The survey's margin of error was 3%.  Construct a confidence interval for the proportion of left-handed golfers.
a)
(0.18 to 0.21)
b)
(0.12 to 0.18)
c)
(0.12 to 0.15)
d)
(0.11 to .19)
9.

Which of the following is the definition of a "point estimate?" Choose the best answer for the definition.

a)

The average of a population.

b)

The average of a sample.

c)

The midpoint of a confidence interval.

d)

The confidence interval.

10.

The amount added and subtracted to the statistic.

a)

Margin of Error

b)

Point Estimator

c)

Statistic

d)

Population

11.

What is the point estimate for the interval (-5 , 13)?

a)

10

b)

9.5

c)

9

d)

-5

12.

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

a)

9.85

b)

3.05

c)

3.50

d)

6.8

13.
The 90% interval for a statistics test was given by 72 +- 7. What is the lower value for the interval?
a)
7
b)
72
c)
65
d)
79

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