Question

In: Statistics and Probability

A study was conducted on the number of minutes spent texting by men and women. A...

A study was conducted on the number of minutes spent texting by men and women. A sample of 20 men spent an average of 82.3 minutes a day texting with a sample standard deviation of 24.7 minutes, whereas a sample of 27 women spent an average of 101.4 minutes a day texting with a sample standard deviation of 27.3 minutes. Use a 0.10 significance level to test the claim that the average number of minutes that men spent texting a day is less than the average number of minutes that women spent texting a day.

Solutions

Expert Solution


Related Solutions

A study was conducted on the number of hours slept by men and women. A sample...
A study was conducted on the number of hours slept by men and women. A sample of 18 men slept an average of 6.1 hours a day with a sample standard deviation of 2.1 hours, whereas a sample of 21 women slept an average of 6.4 hours a day with a sample standard deviation of 1.7 hours. Use a 0.05 significance level to test the claim that the average number of hours that there is a difference between the average...
a. According to a study conducted for Gateway Computers, 60% of men and 70% of women...
a. According to a study conducted for Gateway Computers, 60% of men and 70% of women say that weight is an extremely/very important factor in purchasing a laptop computer. Suppose this survey was conducted using 374 men and 481 women. Do these data show enough evidence to declare that a significantly higher proportion of women than men believe that weight is an extremely/very important factor in purchasing a laptop computer? Use a 5% level of significance. b. Use these data...
A study conducted by the MLC on campus found the number of hours spent at the...
A study conducted by the MLC on campus found the number of hours spent at the MLC during a week. The distribution of times spent at the MLC is normally distributed with an average of 75 minutes and a standard deviation of 18 minutes. (a) If a single student that uses the MLC is selected at random, what is the probability that this student spent between 80 and 100 minutes at the MLC that week? (b) Now if a sample...
A study was conducted to determine if the number of hours spent studying for an exam...
A study was conducted to determine if the number of hours spent studying for an exam is associated with the exam score. The following are the observations obtained from a random sample of 5 students: Number of Hours Spent Studying (X) 8 2 6 4 2 Exam Score (Y) 98 74 87 82 72 The average number of hours spent studying for an exam is _____. Part A: A) 82.6 B) 22 C) 4.4 D) 413 The average exam score...
A study of the total number of minutes spent in the local emergency room revealed that...
A study of the total number of minutes spent in the local emergency room revealed that patients spent on average 162.8 minutes in the ER, with a standard deviation of 53.4 minutes. Assume that the times follow a normal distribution. Let X be the processing time of a randomly selected patient. (a) Describe the probability distribution of X and state its parameters μ and σ. (b) Find the probability that the processing time of a randomly selected patient is i....
A university conducted a study of whether running is healthy for men and women over age...
A university conducted a study of whether running is healthy for men and women over age 50. During the first eight years of the study, 1.9% of the 457 members of a fitness association died. We are interested in the proportion of people over 50 who ran and died in the same eight-year period. NOTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first prove that assumption,...
According to a study conducted for Gateway Computers, 59% of men and 70% of women say...
According to a study conducted for Gateway Computers, 59% of men and 70% of women say that weight is an extremely/very important factor in purchasing a laptop computer. Suppose this survey was conducted using 374 men and 481 women. Do these data show enough evidence to declare that a significantly higher proportion of women than men believe that weight is an extremely/very important factor in purchasing a laptop computer? Use alpha= 0.05. Write the correct R commands for solving this...
A A recent study focused on the number of times men and women send a Twitter...
A A recent study focused on the number of times men and women send a Twitter message in a day. The information is summarized below. Sample Size Sample Mean Population Standard Deviation   Men 23          18          5                  Women 38          38          21                At the .01 significance level, is there a difference in the mean number of times men and women send a Twitter message in a day? What is the p-value for this hypothesis...
Arbitron Media Research Inc. conducted a study of the iPod listening habits of men and women....
Arbitron Media Research Inc. conducted a study of the iPod listening habits of men and women. One facet of the study involved the mean listening time. It was discovered that the mean listening time for a sample of 13 men was 30 minutes per day. The standard deviation was 13 minutes per day. The mean listening time for a sample of 11 women was also 30 minutes, but the standard deviation of the sample was 14 minutes. Use a two-tailed...
Arbitron Media Research Inc. conducted a study of the iPod listening habits of men and women....
Arbitron Media Research Inc. conducted a study of the iPod listening habits of men and women. One facet of the study involved the mean listening time. It was discovered that the mean listening time for a sample of 13 men was 40 minutes per day. The standard deviation was 11 minutes per day. The mean listening time for a sample of 12 women was also 40 minutes, but the standard deviation of the sample was 17 minutes. At the 0.02...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT