Question

Samples of quiz scores for two stats classes with different instructors provide the following results: Instructor...

Samples of quiz scores for two stats classes with different instructors provide the following results:

Instructor A

Mean: 78 Standard deviation: 10 Sample Size: 50

Instructor B

Mean: 72 Standard Deviation: 8 Sample Size: 40

does the evidence suggest that average in Instructor A's class is higher than average in Instructor B's class? Test Allpha=.05. Construct a 95 percent confidence interval for the differences in averages.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Suppose a statistics instructor believes that there is no difference between the mean test scores of...
Suppose a statistics instructor believes that there is no difference between the mean test scores of students taking a morning class and students taking an afternoon class. She takes a sample from each of her classes, one morning and one afternoon. The mean and standard deviation for 40 morning students (sample 1) were 78 and 17.8, respectively. The mean and standard deviation for 45 afternoon students (sample 2) were 82.2 and 19.9. Using ?=0.05, determine if there is a difference...
An administrator claims that the average test scores between two instructors at a school are different....
An administrator claims that the average test scores between two instructors at a school are different. In a sample of 28 students from the first instructor’s class, the average test score was 32 out of 50 points with a standard deviation of 5 points. In a sample of 33 students from the second instructor’s class, the average was 29 out of 50 with a standard deviation of 6 points. Assuming both populations are normally distributed and the population variances are...
Suppose your statistics instructor gave six examinations during the semester. You received the following exam scores...
Suppose your statistics instructor gave six examinations during the semester. You received the following exam scores (percent correct): 83, 78, 87, 91, 95, and 71. To compute your final course grade, the instructor decided to randomly select two exam scores, compute their mean, and use this score to determine your final course grade. a. Compute the population mean. This is your average grade based on all of your grades. (Round your answer to 2 decimal places.) b. Compute the population...
Each of the following three datasets represent IQ Scores for three random samples of different sizes....
Each of the following three datasets represent IQ Scores for three random samples of different sizes. The population mean is 100 population standard deviation is 15. Compute the sample mean, median and standard deviation for each sample size 6) Sample Size 5 106 92 98 103 100
Suppose your statistics instructor gave six examinations during the semester. You received the following exam scores...
Suppose your statistics instructor gave six examinations during the semester. You received the following exam scores (percent correct): 80, 74, 90, 93, 94, and 73. To compute your final course grade, the instructor decided to randomly select two exam scores, compute their mean, and use this score to determine your final course grade. Compute the population mean. This is your average grade based on all of your grades. (Round your answer to 2 decimal places.) Compute the population standard deviation....
Each of the following three datasets represent IQ Scores for three random samples of different sizes....
Each of the following three datasets represent IQ Scores for three random samples of different sizes. The population mean is 100 population standard deviation is 15. Compute the sample mean, median and standard deviation for each sample size: 7) Sample Size 12 106 92 98 103 100 102 98 124 83 70 108 121
Independent random samples taken at two companies provided the following information regarding annual salaries of the...
Independent random samples taken at two companies provided the following information regarding annual salaries of the employees. The population standard deviations are also given below. Company A Company B Sample Size 72 50 Sample Mean (in $1000) 48 43 Population Standard Deviation (in $1000) 12 10 ​ a. We want to determine whether or not there is a significant difference between the average salaries of the employees at the two companies. Compute the test statistic. b. Compute the p-value; and...
Each of the following three datasets represent IQ Scores for three random samples of different sizes....
Each of the following three datasets represent IQ Scores for three random samples of different sizes. The population mean is 100 population standard deviation is 15. Compute the sample mean, median and standard deviation for each sample size: 9) Using the Sample From Problem Eight Above Calculate the Mean of the Sample Means of The Following: Random Sample1 106 98 102 140 103 Random Sample2 092 124 087 093 097 Random Sample3 098 083 121 130 089 Random Sample4 103...
UCF College of Business obtained the following results from two independent random samples on the salaries...
UCF College of Business obtained the following results from two independent random samples on the salaries of a recent graduating class: Sample Economics (1) Majors Sample Marketing (2) Majors Sample Size Economics Majors =36 Sample Size Marketing Majors =54 Mean Sample Economics = $51,230 Mean Sample Marketing =$49,300 Standard Deviation Sample Economics =$1,035 Standard Deviation Sample Marketing =$1,450 Managerial Report Prepare a managerial report that addresses the following issues: What is the degrees of freedom for the t distribution (round...
A drug company is studying the effect of a new drug. In its clinical trials, the...
A drug company is studying the effect of a new drug. In its clinical trials, the researcher used a significance level of .01. By using this significance level instead of the more usual .05, the researcher has A) Expanded the critical region B) Increased the critical value C) Increased the probability of rejecting the Ho 2) When a researcher failed to reject the null hypothesis A) The obtained statistical value is larger than the critical value B) The obtained statistical...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT