WorksheetsStats - Chp. 8
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
Using the z table, determine the critical value for a left-tailed test with α = 0.005
a)
2.58
b)
-2.58
c)
2.33
d)
-2.33
2.
A left tailed test is when μ < k
a)
True
b)
False
3.
For the conjecture "The mean GPA of students is 2.76", the null hypothesis is:
a)
The mean GPA is not 2.76
b)
We accept the hypothesis that the mean GPA is 2.76
c)
The mean GPA is 2.76
d)
The mean GPA is less than 2.76
4.
For the conjecture "The average number of students graduating SHS is more than 120," the alternate hypothesis is:
a)
The average number of students is less than 120.
b)
The average number of students is different from 120
c)
The average number of students is 120.
d)
The average number of students is greater than 120.
5.
What is the critical value for a two-tailed t test when α = 0.05 and n = 16
a)
2.120
b)
1.753
c)
2.131
d)
1.746
6.
State whether the null hypothesis should be rejected on the basis of the given P-value. P-value = 0.234, α = 0.10
a)
Reject
b)
Do not reject
7.
The average age of a wal-mart employee is 38.6 years old. A sample of 15 Wal-mart employees in Illinois revealed that their average age was 40.1 years, with a standard deviation of 2.7 years. What is the test value for a t test of the claim?
a)
t = 2.15
b)
t = 0.049
c)
t = 40.1
d)
t = 1.46
8.
Researchers previously believed that 75% of patients have decreased asthma symptoms while taking a new drug. In a new study, 54 people were given the drug and 48 of them reported decreased symptoms. At α = 0.05, can it be concluded that the effects of the drug are different?
a)
No, because the test value 1.59 is in the non-critical region
b)
Yes, because the test value 2.36 is in the critical region.
c)
No, because the test value 2.36 is in the critical region.
d)
Yes, because the test value 1.59 is in the critical region.
9.
Find the χ2 critical value for n = 20 and α = 0.01 for a left-tailed test.
a)
8.260
b)
36.191
c)
37.566
d)
7.633
10.
A type I error is when the null hypothesis is rejected, when it is really true.
a)
True
b)
False
100 %
