The 90% confidence interval estimate for a population standard deviation when a
ID: 3129861 • Letter: T
Question
The 90% confidence interval estimate for a population standard deviation when a sample variance of 50 is obtained from a sample of 15 items is
Select one:
A. 4.18 to 15.07
B. 5.18 to 11.15
C. 5.44 to 10.32
D. 29.55 to 106.53
Question 8
Not yet answered
Points out of 5.00
Flag question
Question text
A major automobile manufacturer claimed that the frequencies of repairs on all five models of its cars are the same. A sample of 200 repair services showed the following frequencies on the various makes of cars.
Select one:
A. 4.250
B. 7.882
C. 9.488
D. 11.234
E. None of the above answers is correct
Question 9
Not yet answered
Points out of 5.00
Flag question
Question text
Select one:
A. should be rejected
B. should not be rejected
C. should be revised
D. None of these alternatives is correct.
Question 10
Not yet answered
Points out of 5.00
Flag question
Question text
Select one:
A. do not reject Ho
B. reject Ho
C. don not reject Ha
D. None of the above answers is correct
Question 11
Not yet answered
Points out of 5.00
Flag question
Question text
An insurance company has gathered the following information regarding the number of accidents reported per day over a period of 100 days.
Select one:
A. distribution is Poisson
B. distribution is not Poisson
C. distribution is normal
D. distribution is not normal
E. None of the above answers is correct
Question 12
Not yet answered
Points out of 5.00
Flag question
Question text
It is crucial that the variance of a production process be less than or equal to 25. A sample of 22 is taken. The sample variance equaled 26. Construct a 90% confidence interval for the population standard deviation.
Select one:
A. 17.432 to 48.1038
B. 4.3451 to 6.0728
C. 16.7123 to 47.1043
D. 4.0881 to 6.8633
E. None of the above answers is correct
Question 13
Not yet answered
Points out of 5.00
Flag question
Question text
We want to test the hypothesis that the population variances are equal. Refer to above data. The test statistic for this problem equals
Select one:
A. .67
B. .84
C. 1.19
D. 1.50
NEED HELP WITH THIS ASAP PLEASE!
Model of Car Frequency A 32 B 45 C 43 D 34 E 46Explanation / Answer
multiple questions . first 4 questions answered
The 90% confidence interval estimate for a population standard deviation when a sample variance of 50 is obtained from a sample of 15 items is
Select one:
A. 4.18 to 15.07
B. 5.18 to 11.15
C. 5.44 to 10.32
D. 29.55 to 106.53
Confidence Interval Estimate for the Population Variance
Data
Sample Size
15
Sample Standard Deviation
7.0710678
Confidence Level
90%
Intermediate Calculations
Degrees of Freedom
14
Sum of Squares
699.999998
Single Tail Area
0.05
Lower Chi-Square Value
6.5706
Upper Chi-Square Value
23.6848
Results
Interval Lower Limit for Variance
29.5548
Interval Upper Limit for Variance
106.5347
Interval Lower Limit for Standard Deviation
5.44
Interval Upper Limit for Standard Deviation
10.32
Question 8
Question text
A major automobile manufacturer claimed that the frequencies of repairs on all five models of its cars are the same. A sample of 200 repair services showed the following frequencies on the various makes of cars.
Model of Car
Frequency
A
32
B
45
C
43
D
34
E
46
At = 0.05, test the manufacturer's claim. What is the critical value of the test statistic?
Select one:
A. 4.250
B. 7.882
C. 9.488
D. 11.234
E. None of the above answers is correct
Question 9
n = 23 S2 = 60 H0:2 66 Ha: 2 < 66 . What statement should be made about the null hypothesis if significance level is 5%?
Select one:
A. should be rejected
B. should not be rejected
C. should be revised
D. None of these alternatives is correct.
Calculated chi square =20 > 12.34 table value at 5% level.
Question 10
A sample of 61 items provided a sample mean of 932, a sample mode of 900, and a sample standard deviation of 11. Test the following hypotheses using = 0.05. What is your conclusion? H0: 2 80 Ha: 2 > 80
Select one:
A. do not reject Ho
B. reject Ho
C. don not reject Ha
D. None of the above answers is correct
Chi-Square Test of Variance
Data
Null Hypothesis s^2=
80
Level of Significance
0.05
Sample Size
61
Sample Standard Deviation
11
Intermediate Calculations
Degrees of Freedom
60
Half Area
0.025
Chi-Square Statistic
90.7500
Upper-Tail Test
Upper Critical Value
79.0819
p-Value
0.0063
Reject the null hypothesis
Confidence Interval Estimate for the Population Variance
Data
Sample Size
15
Sample Standard Deviation
7.0710678
Confidence Level
90%
Intermediate Calculations
Degrees of Freedom
14
Sum of Squares
699.999998
Single Tail Area
0.05
Lower Chi-Square Value
6.5706
Upper Chi-Square Value
23.6848
Results
Interval Lower Limit for Variance
29.5548
Interval Upper Limit for Variance
106.5347
Interval Lower Limit for Standard Deviation
5.44
Interval Upper Limit for Standard Deviation
10.32
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.