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Homework: Homework 6.2 Question 9, 6.2.17-T Part 1 of 3 The confidence interval for the population mean is (Round to one decimal place as needed.) In a random sample of 25 people, the mean commute time to work was 34.3 minutes and the standard deviation was 7.3 minutes. Assume the population is normally distributed and use a t-distribution to construct a 99% confidence interval for the population mean u. What is the margin of error of μ? Interpret the results. COTT HW Sc points O Points: 0 of 1 Help me solve this. View an example Get more help. Save Clear alla Check answer Show all
In a random sample of eleven people, the mean driving distance to work was 18.3 miles and the standard deviation was 7.5 miles. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 90% confidence interval for the population mean u. Interpret the results. Identify the margin of error. 4.1 miles 1 √i S (0,0) K More Checkanewer X
Homework: Homework 6.2 Identify the margin of error. Question 11, 6.2.19-T Part 1 of 3 (Round to one decimal place as needed.). 15 points O Points: 0 of 1 In a random sample of seven cell phones, the mean full retail price was $595.50 and the standard deviation was $213.00. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 95% confidence interval for the population mean u. Interpret the results. Save Clear all Check answer
In a random sample of 9 cell phones, the mean full retail price was $503.50 and the standard deviation was $191.00. Further research suggests that the population mean is $431.82. Does the t-value for the original sample fall between -to 95 and to os? Assume that the population of full retail prices for cell phones is normally distributed. fall between -toos and to os because to as The t-value of t= (Round to two decimal places as needed.) Get more help Clear all Check answer
|| HomewoIK. Homework U.L In a sample of 15 randomly selected high school seniors, the mean score on a standardized test was 1200 and the standard deviation was 166.7. Further research suggests that the population mean score on this test for high school seniors is 1011. Does the t-value for the original sample fall between -to 99 and to 99? Assume that the population of test scores for high school seniors is normally distributed. GELE The t-value of t= (Round to two decimal places as needed.) fall between -to.99 and to op because tooo - Points: 0 of 1 Help me solve this View an example Get more help. Clear all Check at
A company manufactures tennis balls. When its tennis balls are dropped onto a concrete surface from a height of 100 inches, the company wants the mean height the balls bounce upward to be 55.3 inches. This average is maintained by periodically testing random samples of 25 tennis balls. If the t-value falls between -to 95 and to 95. then the company will be satisfied that it is manufacturing acceptable tennis balls. A sample of 25 balls is randomly selected and tested. The mean bounce height of the sample is 56.3 inches and the standard deviation is 0.25 inch. Assume the bounce heights are approximately normally distributed. Is the company making acceptable tennis balls? Find -to 95 and to 95- -to 95 Help me solve this BILLED View an example Get more help. Clear all Check answer Show all
Next question A company manufactures light bulbs. The company wants the bulbs to have a mean life span of 994 hours. This average is maintained by periodically testing random samples of 16 light bulbs. If the t-value falls between -to so and to so, then the company will be satisfied that it is manufacturing acceptable light bulbs. For a random sample, the mean life span of the sample is 1000 hours and the standard deviation is 24 hours. Assume that life spans are approximately normally distributed. Is the company making acceptable light bulbs? Explain. The company making acceptable light bulbs because the t-value for the sample is t= and to so (Round to two decimal places as needed.) D
Homework: Homework 6.3 Question 12, 6.3.17-T Part 1 of 3 GOLDS HW Score: 0%, 0 of 21 points O Points: 0 of 1 A researcher wishes to estimate, with 90% confidence, the population proportion of likely U.S. voters who think Congress is doing a good or excellent job. Her estimate must be accurate within 2% of the true proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 44% of the respondents said they think Congress is doing a good or excellent job, (c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? n= (Round up to the nearest whole number as needed.) Save ▸
Part 1 of 3 A researcher wishes to estimate, with 95% confidence, the population proportion of families who eat fast food at least once per week. Her estimate must be accurate within 5% of the population proportion. (a) What is the minimum sample size needed assuming that no prior information is available? =(Round up to the nearest whole number as needed.) n= (a) No preliminary estimate is available. Find the minimum sample size needed (b) Find the minimum sample size needed, using a prior study that found that 18% of the respondents said they eat fast food four to six times per week. (c) Compare the results from parts (a) and (b). Points: 0 of 1 Help me solve this View an example Get more help. « Previous Save Clear all Check answer Next >
Translate the statement into a confidence interval. Approximate the level of confidence. In a survey of 1059 adults in a country, 72% said being able to speak the language is at the core of national identity. The survey's margin of error is 13.1%
Translate the statement into a confidence interval. Approximate the level of confidence. In a survey of 1035 adults in a country, 67% said being able to speak the language is at the core of national identity. The survey's margin of error is ±3.1%. (Round to three decimal places as needed.)
Homework: Homework 6.3 Question 17, 6.3.31 Part 1 of 2 The confidence interval for the proportion is (Round to three decimal places as needed.) points O Points: 0 of 1 Save Translate the statement into a confidence interval. Approximate the level of confidence. In a survey of 1000 adults in a country, 77% think teaching is one of the most important jobs in the country today. The survey's margin of error is ±2%. >
Translate the statement into a confidence interval. Approximate the level of confidence. In a survey of 3327 adults in a country, 41% believe the economy is getting better. Three weeks prior to this survey, 59% believed that the economy was getting better. The survey's margin of error is ± 1%. Use the results from the newer survey. The confidence interval for the proportion is (Round to three decimal places as needed.) Clear all Check answer
E Homework: Homework 6.3 Part 1 of 4 Use the results from the survey about getting a second or part-time job. The confidence interval for the proportion is (Round to three decimal places as needed.) points Points: 0 of 1 KID Next question Translate the statement into a confidence interval. Approximate the level of confidence. In a survey of 1074 parents of children ages 8-14, 69% say they are willing to get a second or part-time job to pay for their children's college education and 40% say they lose sleep worrying about college costs. The survey's margin of error is ±3%. Save
Complete the tables for different values of pand q-1-p. From the tables, which value of pappears to give the maximum value of the product pa PG=1-p 0.0 0.1 dela 0.2 0.3 lolo 0.4 0.5 pq 1.0 0.00 0.9 0.09 0.8 Clear all Check answer " 4