Question

A grocery store is interested in determining whether or not a difference exists between the shelf...

  1. A grocery store is interested in determining whether or not a difference exists between the shelf life of two different brands of doughnuts. A random sample of 100 boxes of each brand was selected and the shelf life in days was determined for each box. The sample results are given below.

Brand A

Brand B

mean = 2.1

mean = 2.9

standard deviation = 0.8

standard deviation = 1.7

sample size = 100

sample size = 100

Find a 90% confidence interval for the mean difference between the shelf life of the two brands of doughnuts.

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

Homework Answers

Answer #1


Let me know in the comment section if anything is not clear. I will reply ASAP!

If you like the answer, please give a thumbs-up. This will be quite encouraging for me.Thank-you!

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
You are interested in determining which of two brands of batteries, brand A and brand B,...
You are interested in determining which of two brands of batteries, brand A and brand B, lasts longer under differing conditions of use. One hundred Fenix flashlights are fitted with brand A batteries and 100 Olight flashlights are fitted with brand B batteries. Each battery is used for 72 hours straight. The battery life is then measured for each battery, and the average battery life for the two brands is compared. What is wrong with this experimental design? (3 points)...
A social worker was interested in determining whether there is a significant difference in the average...
A social worker was interested in determining whether there is a significant difference in the average monthly cost per child for childcare outside the home between state supported facilities and privately owned facilities. Two independent random samples were selected yielding the following information. State supported Facilities Privately owned Facilities Sample Size 64 64 Sample Mean 725 675 Sample Standard Deviation 95 80 Based on the 90% confidence interval for the true mean difference in average cost of children (state supported...
Q1.Researchers were interested in determining the relative effectiveness of two different brands of eye drops in...
Q1.Researchers were interested in determining the relative effectiveness of two different brands of eye drops in alleviating the symptoms of 'dry eye syndrome'. Forty subjects, who suffered from 'dry eye syndrome', were randomly assigned to receive either brand A or brand B of the eye-drops - 20 subjects to each brand. The eyedrops were administered to each subject and the time until symptoms returned was recorded for each subject. Based on the information provided, which of the following statement/s is...
6. A fish-processing company is concerned about the shelf life of its new cat food. A...
6. A fish-processing company is concerned about the shelf life of its new cat food. A random sample in Halifax and another sample in Dartmouth were examined. The results are summarized below. Halifax Dartmouth Sample Size 35 40 Sample Mean (months) 13 11 Sample Standard Deviation 1.44 1.52 Is there a difference in the average shelf life between the two locations? Conduct a hypothesis test 0.05 significance level. Use the critical value/rejection point method.
The federal government is interested in determining whether salary discrimination exists between men and women in...
The federal government is interested in determining whether salary discrimination exists between men and women in the private sector. Suppose a sample of 16 women and 25 men are taken from the population of first-level managers in the private sector. The information is summarized as follows (amounts are in thousands of dollars): Women Men n 16 25 X¯ $26.4 $33.3 S $2.6 $3.2 Test H0 : µ1 = µ2  against H1 : µ1 = µ2  where µ1  and µ2  are the mean salary of...
A large corporation is interested in determining whether a relationship exists between the commuting time of...
A large corporation is interested in determining whether a relationship exists between the commuting time of its employees and the level of stress-related problems observed on the job. A study of 113 employees reveals as follows: Stress Level Commuting Time High Moderate Low Total Less than 15 mins 9 5 18 32 In between 15-45 mins 17 8 28 53 More than 45 mins 18 (???) 3 (3.96) 7 28 Total 44 16 53 113 a) Which graph should be...
8.   The business manager of a local health clinic is interested in estimating the difference between...
8.   The business manager of a local health clinic is interested in estimating the difference between the fees for extended office visits in her center and the fees of a newly opened group practice. She gathered the following information regarding the two offices. Health Clinic Group Practice Sample Size 50 visits 45 visits Sample Mean $21 $19 Population Standard Deviation $2.75 $3.00           Develop a 95% confidence interval estimate for the difference between the average fees of the two offices....
Researchers were interested in determining whether awarding extra credit for volunteering would increase the number of...
Researchers were interested in determining whether awarding extra credit for volunteering would increase the number of hours students participated community service. The current average is 2.5 hours per semester. Using the information below, answer the following questions. Using the data below, answer the following questions. What is the null and alternate hypotheses? Indicate the sample size. Indicate the sample mean. Indicate the sample standard deviation. Indicate the Mean difference. What is the t value and degrees of freedom? What is...
Suppose a researcher is interested in answering the following question: Is there a difference between the...
Suppose a researcher is interested in answering the following question: Is there a difference between the mean body temperatures for men and women? He collects data on body temperature and gender from a random sample of 130 men and women. The data collected is shown in the table below. Calculate a 95% confidence interval to answer the researcher’s question. Mean Standard Deviation Sample Size Males 98.105 0.699 65 Females 98.394 0.743 65 Based on your confidence interval, is there a...
For a random sample of 10 light bulbs, the mean bulb life is 4,000 hr with...
For a random sample of 10 light bulbs, the mean bulb life is 4,000 hr with a sample standard deviation 200. For another brand of bulbs, a random sample of 8 has a sample mean of 4,300 hr and a sample standard deviation of 250. Assume that the life of a light bulb is normally distributed and the standard deviations of the two populations are equal. We test the hypothesis that there is no difference between the mean operating life...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT