Homework Answers
1) New mean (x bar)= 18.3 + 5 = 23.3
because adding 5 hours in every employee results in adding 5 hours in mean.
2) New standard deviation = 3.4
As we are increasing 5 hours in every employee work hours results in mean increase of 5 hours. So, adding or subtracting same number of hours in every employee does not affect on standard deviation. So, standard deviation remains same.
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Question 10 of 10 (1 point) 3.2 Section Exercise 44 The mean and standard deviation of...
The mean and standard deviation of the number of hours the employees work in the music...
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Question 6 of 8 (1 point) Attempt 1 of Unlimited 3.2 Section Exercise Time to review:...
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Question 10 of 20 Here again, is the distribution of number hours of exercise per week...
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Question 6 of 20 (1 point) Attempt 1 of Unlimited 3.2 Section Exercise Time to review:...
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Chebyshev's Theorem and the Empirical Rule 1. For a distribution with mean 80 and standard deviation...
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section 10.1 A variable of two populations has a mean of 45 and a standard deviation...
section 10.1
A variable of two populations has a mean of 45 and a standard deviation of 48 for one of the populations and a mean of 45 and a standard deviation of 10 for the other population. Complete parts (a) through (c). a. For independent samples of size 16 and 4, respectively, find the mean and standard deviation of x1 - x2. (Assume that the sampling is done with replacement or that the population is large enough.) The mean...
Among coffee drinkers, men drink a mean of 3.2 cups per day with a standard deviation...
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Q 3 Are employees who work more hours per week less satisfied with their job? Data...
Q 3
Are employees who work more hours per week less satisfied with
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Job satisfaction (measures 0 to 100)
Total hours worked per week
Coefficients
Standard Error
intercept
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16.8721
X variable 1
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0.3188
(a)Construct a 95% confidence interval estimate of the
population mean job satisfaction for employees who works 55 hours
per week. The sample mean total hours worked...
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Question 6 of 8 (1 point) Attempt 1 of Unlimited 3.2 Section Exercise Time to review: The following table presents the time taken to review articles that were submitted for publication to a particular journal during a recent year. A few articles took longer than 6 months to review; these are omitted from the table. Consider the data to be a population. Number of Articles TA Time (Months) 0-0.9 44 16 1.0-1.9 2.0 - 2.9 3.0-3.9 17 20 4.0-4.9 12...
Question 10 of 20 Here again, is the distribution of number hours of exercise per week for 50 male college student: Frequency Hours of Exercise Per Week What are appropriate numerical measures of center and spread in this case? Hours of Exercise Per Week What are appropriate numerical measures of center and spread in this case? The mean and the median. The mean and standard deviation The IQR and standard deviation The mean and IQR The median and standard deviation...
Question 6 of 20 (1 point) Attempt 1 of Unlimited 3.2 Section Exercise Time to review: The following table presents the time taken to review articles that were submitted for publication to a particular journal during a recent year. A few articles took longer than 6 months to review; these are omitted from the table. Consider the data to be a population. Time (Months) Number of Articles 0-0.9 1.0-1.9 2.0 - 2.9 3.0-3.9 4.0 - 4.9 5.0-5.9 Send data to...
Chebyshev's Theorem and the Empirical Rule 1. For a distribution with mean 80 and standard deviation 10 A) What percentage of values will fall between 60 and 100? B) What percentage of values will fall between 50 and 110? 2. The average U.S. yearly per capita consumption of citrus fruit is 26.8 pounds. Suppose that the A) What percentage of Americans would you expect to consume more than 31 pounds of citrus d is bell-shaped with a standard deviation of...
section 10.1
A variable of two populations has a mean of 45 and a standard deviation of 48 for one of the populations and a mean of 45 and a standard deviation of 10 for the other population. Complete parts (a) through (c). a. For independent samples of size 16 and 4, respectively, find the mean and standard deviation of x1 - x2. (Assume that the sampling is done with replacement or that the population is large enough.) The mean...
Q 3
Are employees who work more hours per week less satisfied with
their job? Data was collected from a random sample of 22 employees
at a company on the following variables:
Job satisfaction (measures 0 to 100)
Total hours worked per week
Coefficients
Standard Error
intercept
120.7223
16.8721
X variable 1
-1.2033
0.3188
(a)Construct a 95% confidence interval estimate of the
population mean job satisfaction for employees who works 55 hours
per week. The sample mean total hours worked...
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