Question

A researcher wished to compare the average amount of time spent in extracurricular activities by high...

A researcher wished to compare the average amount of time spent in extracurricular activities by high school students in a suburban school district with that in a school district of a large city. The researcher obtained a simple random sample of 60 high school students in a large suburban school district and found the mean time spent in extracurricular activities per week to be six hours with a standard deviation of three hours. The researcher also obtained an independent simple random sample of 40 high school students in a large city school district and found the mean time spent in extracurricular activities per week to be four hours with a standard deviation of two hours. Let 1 and 2 represent the mean amount of time spent in extracurricular activities per week by the populations of all high school students in the suburban and city school districts, respectively. Assume two-sample t procedures are safe to use? 5. What is a 95% confidence interval for 1 – 2? (Assume that the variances are not equal for the t-statistic.) If we assume that the variances are different for the two groups, what would be the number of degrees of freedom for the two-sample t procedures?

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A researcher was interested in comparing the amount of time spent watching television by women and...
A researcher was interested in comparing the amount of time spent watching television by women and by men. Independent simple random samples of 14 women and 17 men were selected, and each person was asked how many hours he or she had watched television during the previous week. The summary statistics are as follows: Women        Men   _ Sample mean      11.9 hrs      16.9 hrs Sample SD         4.1 hrs        4.8 hrs Sample size            14                17 Use this data and a 0.05 significance...
A researcher wished to compare the average daily hotel room rates between San Francisco and Los...
A researcher wished to compare the average daily hotel room rates between San Francisco and Los Angeles. The researcher obtained an SRS of 15 hotels in downtown San Francisco and found the sample mean x1=$156 , with a standard deviation s1= $15 . The researcher also obtained an independent SRS of 10 hotels in downtown Los Angeles and found the sample mean x2= $143, with a standard deviation s2=$10. Let 1 and 2 represent the mean cost of the populations...
A researcher was interested in comparing the amount of time spent watching television by women and...
A researcher was interested in comparing the amount of time spent watching television by women and by men. Independent simple random samples of 14 women and 17 men were selected, and each person was asked how many hours he or she had watched television during the previous week. The summary statistics are as follows:                                     Women          Men   .         Sample Mean         12.9             16.4         Sample SD             4.0                4.2         Sample Size            14                 17 This sample data is then used to test the claim that the mean time spent watching television by women...
In a survey of collage students, it was found that the amount of time spent on...
In a survey of collage students, it was found that the amount of time spent on reading books per week was normally distributed with a mean of 32 minutes. Assume the distribution of weekly reading time follows the normal distribution with a population standard deviation of 2 minutes. Suppose we select a sample of 20 high school students. 1)  What is the standard error of the mean time? 2)What percent of the sample means will be greater than 32.50 minutes? 3)What...
Full-time college students report spending a mean of 28 hours per week on academic​ activities, both...
Full-time college students report spending a mean of 28 hours per week on academic​ activities, both inside and outside the classroom. Assume the standard deviation of time spent on academic activities is 6 hours. Complete parts​ (a) through​ (d) below. If you select a random sample of 25 ​full-time college​ students, what is the probability that the mean time spent on academic activities is at least 27 hours per​ week?
Today, full-time college students report spending a mean of 27 hours per week on academic activities,...
Today, full-time college students report spending a mean of 27 hours per week on academic activities, both inside and outside the classroom. (Source: “A Challenge to Col- lege Students for 2013: Don’t Waste Your 6,570,” Huffington Post, January 29, 2013, huff.to/13dNtuT.) Assume the standard devia- tion of time spent on academic activities is 4 hours. If you select a random sample of 16 full-time college students, PLEASE USE NORMDIST AND NORMINV IN EXCEL what is the probability that the mean...
Today, full-time college students report spending a mean of 27 hours per week on academic activities,...
Today, full-time college students report spending a mean of 27 hours per week on academic activities, both inside and outside the classroom. (Source: “A Challenge to Col- lege Students for 2013: Don’t Waste Your 6,570,” Huffington Post, January 29, 2013, huff.to/13dNtuT.) Assume the standard devia- tion of time spent on academic activities is 4 hours. If you select a random sample of 16 full-time college students, PLEASE USE NORMDIST AND NORMINV IN EXCEL what is the probability that the mean...
A researcher was interested in comparing the amount of time (in hours) spent watching television by...
A researcher was interested in comparing the amount of time (in hours) spent watching television by women and by men. Independent simple random samples of 14 women and 17 men were selected, and each person was asked how many hours he or she had watched television during the previous week. The summary statistics are as follows. Use a 0.05 significance level to test the claim that the mean amount of time spent watching television by women is smaller than the...
Full-time college students report spending a mean of 25hours per week on academic? activities, both inside...
Full-time college students report spending a mean of 25hours per week on academic? activities, both inside and outside the classroom. Assume the standard deviation of time spent on academic activities is 4 hours. Complete parts? (a) through? (d) below. a. If you select a random sample of 25 ?full-time college? students, what is the probability that the mean time spent on academic activities is at least 24 hours per? week? ?(Round to four decimal places as? needed.) b. If you...
Today, full time college students report spending a mean of 27 hours per week on academic...
Today, full time college students report spending a mean of 27 hours per week on academic activities, both inside and outside of the classroom. Assume the standard deviation of time spent on academic activities is 4 hours. If you select a random sample of 50 full-time college students: A. Describe the shape of the sampling distribution. How do you know it is this shape? B. Find the mean and standard deviation for the distribution of the sample mean (x bar)...