A Moving to another question will save this response.Question 51- How many engineering students must be randomly selected to estimate the mean of monthly study hours from HCT colleges? We want95% confidence that the sample mean is within 4 hours of the population mean, and the population standard deviation is known to be 19hours.AMoving to another question will save this response,

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A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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STATISTICS AND PROBABILITY (UPVOTE WILL BE GIVEN. PLEASE WRITE/CHOOSE THE RIGHT/COMPLETE SOLUTIONS LEGIBLY. NO LONG EXPLANATION NEEDED.)
Fran is training for her first marathon, and she wants to know if there is a significant difference between the mean number of miles run each week by group runners and individual runners who are training for marathons. She interviews 42 randomly selected people who train in groups and finds that they run a mean of 47.1 miles per week. Assume that the population standard deviation for group runners is known to be 4.4 miles per week. She also interviews a random sample of 47 people who train on their own and finds that they run a mean of 48.5 miles per week. Assume that the population standard deviation for people who run by themselves is 1.8 miles per week. Test the claim at the 0.01 level of significance. Let group runners training for marathons be Population 1 and let individual runners training for marathons be Population 2. Step 2 of 3 : Compute the value of the test statistic. Round your answer to two decimal places.
Can you please help me with this two questions
Nintendo is doing a classic game competition for the anniversary of Super Mario Bros. The average runtime for a straight playthrough is 1 hour and 58 minutes (with a standard deviation of 6 minutes). Out of all of the players who compete in this competition (120 players), the fastest 10% will get a chance at a special reward. What would be the benchmark playthrough time for this competition?
Calculate the estimated standard error for the case where the sample standard deviation is 25 and the sample size 137. Answer to three decimal places if necessary, you may round up or down.
You are part of a trivia team and have tracked your team's performance since you started playing, so you know that your scores are normally distributed with u = 76 and o = 12. Recently, a new person joined the team, and you think the scores have gotten better. The sample data is n = 12, sample mean = 86 Assuming a one tailed test, What is the test statistic?
Question 5 > Past surveys indicate that 58% of Americans personally worry a great deal about federal spending and the budget deficit. Would it be considered unusual to have a random sample of 193 Americans where 143 of them personally worry a great deal about federal spending and the budget deficit? (We say that any observation more than 2 standard deviations from the mean is unusual.) оо Yes No Cannot tell from the information given
Question 4
If the highest 8o of students in the final exam were rewarded. The mean for this exam was 120 & the variance was 289. What was the lowest mark that has been rewarded for? minimum mark-? Select one: 143.8 143.97 NONE 143.885
Researchers wants to determine if low-fat diets or low-carb diets are more effective for weight loss. Suppose 100 people were placed on a low-fat diet and at the end of 3 months the mean weight loss was 10.5 lbs witha standard deviation of 12.5 lbs. There were another 100 people placed on a low-carb diet and at the end of 3 months the mean weight loss was 16.5 lbs with a standard deviation of 10.2 lbs. Does mean weight lossdiffer between the two diets? What are the hypotheses??

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