Question

A survey asked orchestra members to estimate the number of hours they practice on a typical...

A survey asked orchestra members to estimate the number of hours they practice on a typical day. From the results, it was determined that 25 pianists reported practicing an average of 4.1 hours a day with a standard deviation of 0.77, while 31 percussionists reported practicing an average of 3.7 hours a day with a standard deviation of 1.03. Using ?=0.05, test the claim that pianists practice longer than percussionists.
a. Are the samples independent or dependent? Explain how you know.



b. What are the null and alternative hypotheses?




c. Would the test be one-tailed or two-tailed? Explain how you know.



d. ?-test or ?-test? Explain how you know. What would be the critical value(s)?




e. Calculate the test statistic. What decision is justified by your work?






f. Summarize your results.

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
According to the American Time Use Survey, the typical American spends 153.9 minutes (2.57 hours) per...
According to the American Time Use Survey, the typical American spends 153.9 minutes (2.57 hours) per day watching television. A survey of 50 Internet users results in a mean time watching television per day of 127.9 minutes, with a standard deviation of 46.9 minutes. Conduct the appropriate test to determine if Internet users spend less time watching television at the ⍶ = 0.05 level of significance.
A cell phone manufacturer claims that the batteries in its latest model provide 20 hours of...
A cell phone manufacturer claims that the batteries in its latest model provide 20 hours of continuous use. In order to verify this claim, and independent testing firm checks the battery life of 100 phones. They find that the batteries in these 100 phones last an average of 19 hours with a standard deviation of 5 hours. Conduct an appropriate hypothesis test to check whether the results from this sample provide sufficient evidence that the true mean battery life is...
The 2012 general Social Survey asked a large number of people how much time they spent...
The 2012 general Social Survey asked a large number of people how much time they spent watching TVeach day. The mean number of hours was 3.09 with a standard deviation of 2.83. Assume that in a sampleof 45 teenagers, the sample standard deviation of daily TV time is 4.1 hours, and that the population ofTV watching times is normally distributed. Can you conclude that the population standard deviation ofTV watching times for teenagers differs from 2.83? Use theα= 0.10 level...
A class survey in a large class for first-year college students asked, "About how many hours...
A class survey in a large class for first-year college students asked, "About how many hours do you study during a typical week?" The mean response of the 468 students was x = 15.3 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation σ = 8.5 hours in the population of all first-year students at this university. Regard these students as an SRS from the population of all first-year students at this university....
A survey in a large class for first-year college students asked, "About how many hours do...
A survey in a large class for first-year college students asked, "About how many hours do you study during a typical week?" The mean response of the 461 students was x = 15.3 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation σ = 8.5 hours for all first-year students at this university. Does the survey results provide evidence (at the 0.05 level) of students claiming to study more than 15 hours per...
A class survey in a large class for first-year college students asked, "About how many hours...
A class survey in a large class for first-year college students asked, "About how many hours do you study in a typical week?". The mean response of the 460 students was x¯¯¯x¯ = 16 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation 8 hours in the population of all first-year students at this university. What is the 99% confidence interval (±±0.001) for the population mean? Confidence interval is from  to  hours.
Imagine that you have been asked to defend to the board members of your employer your...
Imagine that you have been asked to defend to the board members of your employer your estimate of the average weekly sales potential of a new product, Widget Plus. You have test-marketed Widget Plus weekly for 36 weeks and gathered the sales data. The results were 300 units per week with a standard deviation of 60 units per week. In 400-500 words explain to the board members (as if they were college freshmen) your estimate using a confidence interval and...
A class survey in a large class for first-year college students asked, "About how many hours...
A class survey in a large class for first-year college students asked, "About how many hours do you study during a typical week?" The mean response of the 493 students was x = 15.3 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation σ = 8.5 hours in the population of all first-year students at this university. Regard these students as an SRS from the population of all first-year students at this university....
A class survey in a large class for first-year college students asked, "About how many hours...
A class survey in a large class for first-year college students asked, "About how many hours do you study during a typical week?" There were 464 responses to the class survey. Suppose that we know that the study time follows a Normal distribution with standard deviation σ = 8.6 hours in the population of all first-year students at this university. One student claimed to study 10,000 hours per week (10,000 is more than the number of hours in a year)....
A class survey in a large class for first‑year college students asked, “About how many hours...
A class survey in a large class for first‑year college students asked, “About how many hours do you study during a typical week?” The mean response of the 463463 students was ?¯=13.7x¯=13.7 hours. Suppose that we know that the study time follows a Normal distribution with standard deviation ?=7.4σ=7.4 hours in the population of all first‑year students at this university. Regard these students as an SRS from the population of all first‑year students at this university. Does the study give...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT