Question 3 A researcher wants to test if the elementary school children spend less than 30...
Question 3
A researcher wants to
test if the elementary school children spend less than 30 minutes
per day on homework. A random sample of 64 children from the school
shows that they spend an average of 24.5 minutes per day on
homework. Assume that the standard deviation = 15.3 minutes, and
that the test is to be made at the 1% significance level.
What is the critical value?
|
-2.06 |
||
|
-2.33 |
||
|
-2.58 |
||
|
-1.96 |
Homework Answers
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Question 3
A researcher wants to
test if the elementary school children spend less than 30...
A researcher wants to test if the elementary school children spend less than 30 minutes per...
A researcher wants to test if the elementary school children spend less than 30 minutes per day on homework. Suppose we make the test at the 1% significance level. A sample of 61 children selected from this school shows that they spend an average of 28 minutes per day on home work with a standard deviation of 4 minutes. a.) Write the claim using an appropriate math expression b.) Define the Null and Alternate Hypotheses c.) Find the p-value d.)...
1. The following frequency distribution shows the results of a sample of elementary school children. The...
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1. The following frequency distribution shows the results of a sample of elementary school children. The...
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Question 1 O pts Problem 1: (21 points] Young children in the United States are exposed...
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Suppose that Vera wants to test the hypothesis that women make less money than men doing...
Suppose that Vera wants to test the hypothesis that women make less money than men doing the same job. According to the Bureau of Labor Statistics (BLS), the median weekly earnings for men in the sales and office occupation sector in 2015 was $704. Vera collected median weekly earnings data for women in 2015 from a random subset of 18 positions in the sales and office occupation sector. The following is the sample data. S627, 5617, S732, S735, $639, S569,...
Suppose Diana, an educational researcher at a local university, wants to test the impact of a...
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1. The following frequency distribution shows the results of a sample of elementary school children. The study was to determine the number of minutes per day that elementary school children spend on the internet (outside of school activities). Internet Usage (Time in Min) Frequency 7-18 6 19-30 10 13 31 - 42 43 - 54 8 55-66 5 67 - 78 6 79-90 2 a. Find the mean internet usage time. Round answer to one decimal place. b. Find the...
1. The following frequency distribution shows the results of a sample of elementary school children. The study was to determine the number of minutes per day that elementary school children spend on the internet (outside of school activities). Frequency 6 10 Internet Usage (Time in Min) 7 - 18 19 - 30 31 - 42 43 - 54 55 - 66 67 - 78 79-90 13 8 5 6 2 Find the mean internet usage time. Round answer to one...
A business school placement director wants to estimate the mean annual salaries 5 years after students graduate. A random sample of such graduates found a sample mean of $427,400. A confidence interval for the population mean annual salaries 5 years after students graduate is then estimated to be from $419,020 to $435,780. If the placement director considers that this confidence interval is too wide and would like to have an interval of half width only, what should he do? Select...
Question 1 O pts Problem 1: (21 points] Young children in the United States are exposed on an average of 4 hours of background television per day. Having the television on in the background while children are doing other activities may have adverse consequences on a child's well-being. You have a research hypothesis that children from low-income families are exposed to more thart 4 hours of daily background television. In order to test this hypothesis, you have collected data on...
Suppose that Vera wants to test the hypothesis that women make less money than men doing the same job. According to the Bureau of Labor Statistics (BLS), the median weekly earnings for men in the sales and office occupation sector in 2015 was $704. Vera collected median weekly earnings data for women in 2015 from a random subset of 16 positions in the sales and office occupation sector. The following is the sample data. $566, $648, $767, $683, $604, $727,...
Suppose that Vera wants to test the hypothesis that women make less money than men doing the same job. According to the Bureau of Labor Statistics (BLS), the median weekly earnings for men in the sales and office occupation sector in 2015 was $704. Vera collected median weekly earnings data for women in 2015 from a random subset of 18 positions in the sales and office occupation sector. The following is the sample data. S627, 5617, S732, S735, $639, S569,...
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