Suppose that a recent article stated that the mean time spent in jail by a first-time...
Suppose that a recent article stated that the mean time spent in jail by a first-time convicted burglar is 2.5 years. A study was then done to see if the mean time has increased in the new century. A random sample of 27 first-time convicted burglars in a recent year was picked. The mean length of time in jail from the survey was four years with a standard deviation of 1.9 years. Suppose that it is somehow known that the population standard deviation is 1.4. Conduct a hypothesis test to determine if the mean length of jail time has increased. Assume the distribution of the jail times is approximately normal.
Calculate the following. (Enter exact numbers as integers, fractions, or decimals.)
(a) x (bar)
(b) σ
(c) sx
(d) n
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Suppose that a recent article stated that the mean time spent in
jail by a first-time...
Suppose that a recent article stated that the mean time spent in jail by a first-time...
Suppose that a recent article stated that the mean time spent in jail by a first-time convicted burglar is 2.5 years. A study was then done to see if the mean time has increased in the new century. A random sample of 27 first-time convicted burglars in a recent year was picked. The mean length of time in jail from the survey was four years with a standard deviation of 1.9 years. Suppose that it is somehow known that the...
An article in the San Jose Mercury News stated that students in the California state university...
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Facebook: A study showed that two years ago, the mean time spent per visit to Facebook...
Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 19.8 minutes. Assume the standard deviation is o=10.0 minutes. Suppose that a simple random sample of 101 visits was selected this year and has a sample mean of x = 22.8 minutes. A social scientist is interested to know whether the mean time of Facebook visits has increased. Use the a=0.10 level of significance and the critical value method with the table. Part:...
Suppose that Max is a climate change scientist and butterfly enthusiast. In Max's locale, the mean summer temperature o...
Suppose that Max is a climate change scientist and butterfly enthusiast. In Max's locale, the mean summer temperature over the last ten years was higher than it was in the previous ten years. Max wonders if the size of adult male monarch butterflies has changed with the temperature difference. He knows that in his locale, historically, the mean rear wing length of adult male monarchs was 38.3 mm. He collects a random sample of n adult male monarchs to compare...
Suppose that for the past several decades, daily precipitation in Orlando, Florida has had a mean of 3.5 mm and a standard deviation of 10.1 mm.
Suppose that for the past several decades, daily precipitation in Orlando, Florida has had a mean of 3.5 mm and a standard deviation of 10.1 mm. Researchers suspect that in recent years, the mean amount of daily precipitation has changed, so they plan to obtain data for a random sample of 200 days over the past five years and use this data to conduct a one-sample z-test a H0: μ = 3.5 mm against H1:μ ≠ 3.5 mm, where is...
2)According to a 2009 Reader's Digest article, people throw away about 12% of what they buy...
2)According to a 2009 Reader's Digest article, people throw away about 12% of what they buy at the grocery store. Assume this is the true proportion and you plan to randomly survey 68 grocery shoppers to investigate their behavior. What is the probability that the sample proportion does not exceed 0.18? Note: You should keep at least 4 decimal places for any intermediate calculations you make to match wamap's approach and calculations. Answer = (Enter your answer as a number accurate...
The mean age of De Anza College students in a previous term was 26.6 years old....
The mean age of De Anza College students in a previous term was 26.6 years old. An instructor thinks the mean age for online students is older than 26.6. She randomly surveys 56 online students and finds that the sample mean the 5% level s 29.8 with a standard deviation of 2.1. Conduct a hypothesis test Note: If you are using a Student's t-distribution for the problem, you may assume that the underlying population is normally distributed. (In general, you...
1. According to a recent report, 38% of adults wait until they are 30 years of...
1. According to a recent report, 38% of adults wait until they are 30 years of age or older to get married for the first time. A researcher believes this claimed value is too low. He gathers data in order to test the hypotheses Ho: p = 0.38 vs. Ha: p > 0.38. In these hypotheses, what does p represent? A. The p-value B. The sample proportion C. The population proportion D. The sample mean E. The population mean 2....
________________ ________________ ______________ 11. Using Excel - Scatter diagrams, estimated regression equations, and trendlines Suppose a...
________________
________________
______________
11. Using Excel - Scatter diagrams, estimated regression equations, and trendlines Suppose a company records data on sales calls, induding the length of each call and whether a sale was made. The manager is interested in determining whether there is a relationship between the average time spent per call and the number of sales made by each employee, so she obtains the average call length and the total number of sales over a 2-week period for a...
First, read the article on "The Delphi Method for Graduate Research." ------ Article is posted below...
First, read the article on "The Delphi Method for Graduate Research." ------ Article is posted below Include each of the following in your answer (if applicable – explain in a paragraph) Research problem: what do you want to solve using Delphi? Sample: who will participate and why? (answer in 5 -10 sentences) Round one questionnaire: include 5 hypothetical questions you would like to ask Discuss: what are possible outcomes of the findings from your study? Hint: this is the conclusion....
Facebook: A study showed that two years ago, the mean time spent per visit to Facebook was 19.8 minutes. Assume the standard deviation is o=10.0 minutes. Suppose that a simple random sample of 101 visits was selected this year and has a sample mean of x = 22.8 minutes. A social scientist is interested to know whether the mean time of Facebook visits has increased. Use the a=0.10 level of significance and the critical value method with the table. Part:...
Suppose that Max is a climate change scientist and butterfly enthusiast. In Max's locale, the mean summer temperature over the last ten years was higher than it was in the previous ten years. Max wonders if the size of adult male monarch butterflies has changed with the temperature difference. He knows that in his locale, historically, the mean rear wing length of adult male monarchs was 38.3 mm. He collects a random sample of n adult male monarchs to compare...
The mean age of De Anza College students in a previous term was 26.6 years old. An instructor thinks the mean age for online students is older than 26.6. She randomly surveys 56 online students and finds that the sample mean the 5% level s 29.8 with a standard deviation of 2.1. Conduct a hypothesis test Note: If you are using a Student's t-distribution for the problem, you may assume that the underlying population is normally distributed. (In general, you...
________________
________________
______________
11. Using Excel - Scatter diagrams, estimated regression equations, and trendlines Suppose a company records data on sales calls, induding the length of each call and whether a sale was made. The manager is interested in determining whether there is a relationship between the average time spent per call and the number of sales made by each employee, so she obtains the average call length and the total number of sales over a 2-week period for a...
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