In a sample of of 150 Tennessee farmers, the average number of hours worked per day was 15. After analyzing the data you are 95% confident that the average number of worked hours for all farmers in Tennessee is between 12.5 and 16.5. Determine the following:
In a sample of of 150 Tennessee farmers, the average number of hours worked per day...
You are to estimate the average number of hours that students who are planning to enroll at a college in the fall semester will be taking. You don’t know the standard deviation (or variance), but from previous semesters you have an idea about the range. Historically, the lowest number of hours taken is 1 (usually a PE course). At the other end of the spectrum, the most hours a student has ever been enrolled for is 24. Using industry convention,...
Table 6 It is believed that, the average numbers of hours spent studying per day (HOURS) during undergraduate education should have a positive linear relationship with the starting salary (SALARY, measured in thousands of dollars per month) after graduation. Given below is the Excel output for predicting starting salary (Y) using number of hours spent studying per day (X) for a sample of 51 students. NOTE: Only partial output is shown. Note: 2.051E - 05 = 2.051 ∗ 10-05 and...
A survey was undertaken to estimate the hours worked per week by volunteers in a social service agency. The agency provides telephone support 7 days a week for 12 hours each day. There are currently 12,478 volunteers across the country. This number is the number recorded in the volunteer register on 1 May 2018. 100 of these volunteers were randomly chosen. The 100 were each sent an email and asked to record the total hours they worked for the week...
Do male and female servers at Swank Bar work the same number of hours? A sample of 75 female servers worked an average of 33 hours per week, with a standard deviation of 2. A sample of 75 male servers worked an average of 24 hours per week, with a standard deviation of 5.Let μ1μ1 and μ2μ2 represent the typical number of hours worked by all female and male servers at Swank Bar, respectively. Estimate with a 97% confidence level how many more hours...
In a law office, the average number of billed hours per day was 145 last year. In the first 65 days of this year, the average number of billed hours per week is 152 with a standard deviation of 45 hours. When testing the hypothesis that the average number of billed hours has increased year this year, the test statistic is 1.77. If the critical value is 1.96, what is your conclusion concerning the null hypothesis? Please show work.
Confidence Intervals using the one-sample t-statistic A researcher was interested in estimating the average number hours of sleep of her graduate statistics students. The researcher obtained a random sample of 6 graduate statistics students and asked them the number of hours of sleep. She then calculated a 95% confidence interval to estimate the population average number of hours of sleep The data appear in the table below. Hours of sleep 19 21 21 30 21 20
Suppose we want to estimate the difference between the average number of hours worked per week by all Americans with a college degree and those without a college degree. Summary information for each group is shown in the tables. 200 College degree 100 20 80 250 No college degree 50 80 Hours worked per week Statistic College Degree No College Degree Mean42.5 hours SD 39.1 hours 14.9 hours 14.7 hours 467 646 1. Create a 95% confidence interval for the...
1. A random sample of 37 employees in Sweden worked an average number of 231 days per year. The sample standard deviation is 26 days. a) Develop a 95% confidence interval for the average number of work-days per year for all Swedish employees. (6 marks) b) Verbally interpret the meaning of the confidence interval that you found for part a) c) If the desired margin of error for the above confidence interval is 4 days, what size sample is necessary?...
A random sample of 46 college students reported the number of hours per day they typically spend on social media. Their sample mean is, M = 2.61, and their standard deviation is, s = 1.02. What is the point estimate of the mean time spent per day on social media for the population of college students?
In a law office, the average number of billed hours per day was 147 last year. In the first 74 days of this year, the average number of billed hours per day is 157 with a standard deviation of 61 hours. When testing the hypothesis (at the 10% level of signficance) that the average number of billed hours per day has increased, what test statistic?