The number of hours spent per week on household chores by all adults has a mean...
The number of hours spent per week on household chores by all adults has a mean of 26.4 hours and a standard deviation of 6.9 hours. The probability, rounded to four decimal places, that the mean number of hours spent per week on household chores by a sample of 60 adults will be more than 26.75 is?
The number of hours spent per week on household chores by all adults has a mean of 26.4 hours and a standard deviation of 6.9 hours. The probability, rounded to four decimal places, that the mean number of hours spent per week on household chores by a sample of 60 adults will be more than 26.75 is:
A researcher wants to determine a 99% confidence interval for the mean number of hours that adults spend per week doing community service. How large a sample should the researcher select so that the estimate is within 1.4 hours of the population mean? Assume that the standard deviation for time spent per week doing community service by all adults is 3 hours.
A past study claimed that adults in America spent an average of 18 hours a week on leisure activities. A researcher wanted to test this claim. She took a sample of 10 adults and asked them about the time they spend per week on leisure activities. Their responses (in hours) are as follows. 11.1 12.7 20.8 20.9 23.3 33.9 17 17.9 20.2 21.2 Assume that the times spent on leisure activities by all adults are normally distributed. Using the 5%...
A past study claimed that adults in America spent an average of 18 hours a week on leisure activities. A researcher wanted to test this claim. She took a sample of 10 adults and asked them about the time they spend per week on leisure activities. Their responses (in hours) are as follows. 12.0 13.3 22.6 22.9 22.5 33.1 16 17.2 20.1 20.3 Assume that the times spent on leisure activities by all adults are normally distributed. Using the 5%...
The distribution of the number of hours that a random sample of people spend doing chores per week i shown in the pie chart Use 32 as the estimate the sampke mean and the sample standard deviation of the data set midpoint for "30+hours-Make a frequency dotrbtion for the data Then use the table to Click the icon to view the pie chart Class Frequency 0.4 10-14 15-19 25-29 30+ Find an approximation for the sample mean (Type an integer...
The number of hours spent online by college students is claimed to be 22.5 hours per week with a standard deviation of 2.1 hours. a)suppose we randomly select 50 college students, what is the probability that the mean number of hours online is greater than 25 B) Suppose i survey the 50 game programming students and the mean number of hours spent online is 25 hours per week. Is this unusual? Why or why not?
1. To determine the average number of hours spent studying by college students per week, a sample of 39 students was randomly selected, and found to spend an average of 17.1 hours per week, with a standard deviation of 4.3 hours. Find the 90% confidence interval for the mean number of hours spent studying per week by all college students. What is the upper and lower bound? 2. If I asked a random student how many hours they study per...
According to Nielsen Media Research, the average number of hours of TV viewing per household per week in the United States is 50.4 hours. Suppose the standard deviation is 11.8 hours and a random sample of 42 U.S. households is taken. A. What is the probability that the sample average is more than 52 hours? B. What is the probability that the sample average is less than 47.5 hours? C. What is the probability that the sample average is less than 40 hours?...
In a growing industry, the mean number of hours of productivity lost by employees per week due to online social media engagement is 9 hours, with a standard deviation of 1.6 hours. Note: Assume the population data is normally distributed. Standard Normal Distribution Table a. What is the probability that an employee will lose more than 11 hours of productivity due to online social media engagement? P(X > 11)=P(X > 11)= Round to four decimal places if necessary b. What...