WorksheetsStatistics Chp. 7
Total questions: 10
Worksheet time: 8mins
Name
Class
Date
1.
Which of the following is a property of the t-distribution?
a)
Used when sigma is known
b)
Based on degrees of freedom
c)
Positively skewed
d)
None of these
2.
If n = 80 and x = 40 find p̂
a)
2
b)
0.2
c)
0.5
d)
4
3.
A good estimator should be _______
a)
Biased
b)
Consistent
c)
Unefficient
d)
Unrealistic
4.
The three confidence levels most often used are _______ , 95%, and 99%
a)
94%
b)
92%
c)
98%
d)
90%
5.
What is the best point estimate for the population mean?
a)
Sample mean
b)
Sample median
c)
Sample proportion
d)
Sample mode
6.
What is the best point estimate for the population proportion?
a)
sample mean
b)
sample standard deviation
c)
sample proportion
d)
sample median
7.
What is the correct za/2 to use for 95% confidence?
a)
2.58
b)
1.96
c)
1.65
d)
2.08
8.
If n = 25, how many degrees of freedom are there?
a)
24
b)
25
c)
26
d)
23
9.
What type of interval uses "Binomial" for one of it's conditions?
a)
Z interval for a mean
b)
t interval for a mean
c)
Chi-square interval for standard deviation
d)
z interval for a proportion
10.
If you would like to be 95% confident, what is the value of alpha?
a)
95%
b)
5%
c)
2.5%
d)
1%
100 %
