An automobile manufacturer needs to estimate the average highway fuel economy (miles per gallon) for a new truck that will be sold starting next year. A random sample of 137 trucks were tested for highway fuel economy and the sample had a mean of 31.4 miles per gallon with a standard deviation of 4.9 miles per gallon Using a 80% confidence level, determine the margin of error, E, and a confidence interval for the average highway fuel economy of this new truck. Report the confidence interval using interval notationRound solutions to two decimal places , if necessary The margin of error is given by E = A 80% confidence interval is given by

Q: A random sample of 40 students taken from a university showed that their mean GPA is 2.94 and the…

A: Obtain the 99% confidence interval for the population mean GPA of students: Denote the population…

Q: A student researcher compares the heights of American students and non-American students from the…

A: American students:Sample size Sample mean Sample standard deviation Non-American students:Sample…

Q: A researcher would like to estimate the mean weight of all adult male American alligators in the…

A: Givensample size(n)=80Mean(x)=522standard deviation(σ)=25Confidence level=96%

Q: A laboratory tested 58 chicken eggs and found that the mean amount of cholesterol was 109…

A: Given Information: Sample size (n) = 58 Sample mean (x¯) = 109 milligrams Population standard…

Q: Assume a researcher wants to compare the mean Alanine Aminotransferase (ALT) levels in two…

A: x¯1=69, s1=19, n1=38x¯2=32, s2=14, n2=37

Q: A random sample of 300 high school students in a particular town showed that 165 smoke on a regular…

A: Given Information: Sample size (n) = 300  Proportion of students who smoke (p) = 165/300 = 0.55

Q: In a test of the effectiveness of garlic for lowering cholesterol, 48 subjects were treated with…

A: From the provided information, Sample size (n) = 48 Sample mean (x̄) = 2.7 Sample standard deviation…

Q: A researcher would like to estimate the mean weight of all adult male American alligators in the…

A: Sample size (n) = 105Sample mean (x̅) = 502Standard deviations (σ) = 29Significance level (α) = 1 -…

Q: A random sample of 12 chemists from Washington stats shows an average salary of $39,420 with a…

A: The sample mean one (Washington): x¯1=$39,420, sample mean two (New Mexico): x¯2=$30,215, population…

Q: A forester with the National Park Service was tasked with estimating the average age of the bald…

A:

Q: mi/gallon. A simple random sample of 49 cars of this model is chosen and found to have a mean gas…

A: It is given that  Sample mean = 27.5 Population standard deviation = 4 Sample size = 49

Q: researcher was interested in the mean corn yeild for farmers in Illinois. She took an SRS of 28…

A: Given that  Margin of error =E =3.5 Population standard deviation =13.25 95% confidence level.

Q: in a test of the effectiveness of garlic for Lauren cholesterol, 48 subjects were treated with…

A: From the provided information, Sample size (n) = 48 Sample mean (x̅) = 5.4 Sample standard deviation…

Q: An automobile manufacturer needs to estimate the average highway fuel economy (miles per gallon) for…

A: Solution

Q: An investigator conducts a study to investigate whether there is a difference in mean PEF in…

A:

Q: Find Ta/2 for a 90% confidence interval and a sample size of 30.

A: 90% confidencve inetrval for Sample size : n = 30Critical value of T = ?

Q: The total of individual weights of garbage discarded by 17 households in one week is normally…

A:

Q: The housing market recovered slowly from the crisis of 2008. Realtors in one community have recently…

A: The housing market recovered slowly from the crisis of 2008. Realtors in one community have recently…

Q: Assume a researcher wants to compare the mean Alanine Aminotransferase (ALT) levels in two…

A: Consider µD is the mean ALT levels for individuals who drink alcohol and the µND is the mean ALT…

Q: A survey of 100 customers showed that 36 of them preferred brand B of a particular product. Give a…

A: p = proportion of people vote for BSample size : n = 100Number of favorable outcomes : x =…

Q: The health of the bear population in Yellowstone National Part is monitored by periodic measurements…

A: Given that Sample size n = 54 Sample mean M = 182.9 And pioulation SD = 121.8 The critical value of…

Q: A survey of college students reported that in a sample of 371 male students, the average number of…

A: Obtain the 98% confidence interval for the difference between men and women in the mean number of…

Q: In a test of the effectiveness  of garlic for lowering  cholesterol,  48 subjects  were treated with…

A: We have given that,  Sample mean (x̄) = 5.5 , standard deviation     (s) = 17.5 and sample size (n)…

Q: In a test of the effectiveness of garlic for lowering cholesterol, 42 subjects were treated with…

A: Given: The number of subjects that were treated with garlic in a processed tablet form are n=42. The…

Q: random sample of 15 students was selected from a population size of 100 (normal) in a certain…

A:

Q: In a test of the effectiveness of garlic for lowering cholesterol, 50 subjects were treated with…

A:

Q: Researchers from a certain country were interested in how characteristics of the spleen of residents…

A: Males Sample size, n1=93 Sample mean, x¯1=11.2 Sample sd, s1=0.8   Females Sample size, n2=107…

Q: A study analyzed the body fat percentage of 80 ISU students. The sample mean was 23.70 and the…

A:

Q: A city planner wants to estimate the average monthly residential water usage in the city. He…

A:

Q: Glaucoma is a leading cause of blindness in a certain country. An ophthalmologist measured the…

A: A confidence interval is a numeric value that a researcher will be reasonably confident in and…

Q: Does the data provide sufficient evidence to indicate a difference in the home sales prices between…

A:

Q: When 89 people used the Atkins diet for one year, their mean weight change was 6.4 lb (based on…

A: We have given that,   mean weight change (x̄) = 6.4, standard deviation (s) = 6.8 and sample size…

Q: The lead levels in a random sample of 23 crows in the region were measured and recorded. The mean…

A:

Q: na test of the effectiveness of garlic for lowering cholesterol, 42 subjects were treated with…

A:

Q: A quality control manager at a light bulb factory needs to estimate the mean life of a large…

A:

Q: The pH of rain, measured at a weather station in Michigan, was observed for 39 consecutive rain…

A:

Q: An automobile manufacturer needs to estimate the average highway fuel economy (miles per gallon) for…

A:

Q: A researcher collected sample data for 16 women ages 18 to 24. The sample had a mean serum…

A: Obtain the 90% confidence interval for the mean serum cholesterol level of all women in this age…

Q: An SRS of 23 students at TSU gave an average height of 5.6 feet and a standard deviation of .1 feet.…

A:

Q: A random sample of 120 rhesus monkeys found that the number of rhesus monkeys that live in a captive…

A: Solution-: Let, X= The number of rhesus monkeys that live in a captive breeding facility Given:…

Q: A sample of 52 American adults found they generated a mean of 4.3 pounds of waste per day with a…

A:

Q: Explain what would happen to the length of the interval if the confidence level were decreased to…

A: Here Given  Sample size=n=60 Sample mean=x¯=12.88 And From Normal table Critical values for  95 C.I…