A sample of 6 credit ratings for car loan applicants has a mean of 602 and a variance of 4356. Use the data toconstruct a 90% confidence interval for the population standard deviation of credit scores for all applicantsfor car loans. What is the Best point estimate and Include the written statement

Q: From a population with a variance of 1521, a sample of 225 items is selected. At 95% confidence, the…

A: We have given that,  Variance (s2) = 1521, sample size (n) = 225 and confidence interval = 95%…

Q: In a manufacturing process, a random sample of 9 bolts has a mean length of 3 inches with a sample…

A:

Q: From a random sample of 64 high school seniors, the sample mean and standard deviation of the math…

A: Given,sample size(n)=64sample mean(x)=90standard deviation(s)=7degrees of…

Q: The heights of 8 Japanese men were taken with sample mean of 155 cm (centimeters) and standard…

A:

Q: The average weight of 36 randomly selected school buses was 4150 pounds with a standard deviation of…

A: Given data,x=4150σ=480n=36z-value at 99% confidence is Zc=2.576

Q: If the variance of the Electrical Engineering board examination result is 36, what is the minimum…

A:

Q: If a sample of 4 fish from my pond has mean weight 157 grams with a standard deviation of 8.3 grams…

A: Solution: Let X be the weight of fish in my pond. From the given information, n=4, x-bar = 157…

Q: A random sample of 40 home theater systems has a mean price of $500 and a standard deviation of $60.…

A: Construct the 99% confidence interval for the population mean The 99% confidence interval for the…

Q: A sample of 15 car owners showed that their average repair bill was $300 with a standard deviation…

A: It is given that sample mean is $300 and standard deviation is $32.

Q: From the scores in subject EQT203 for 8 students, it was found that the mean score is 73 and the…

A: We have given that, Sample mean (x̄) = 73, sample size (n)= 8 and standard deviation (s) = 5.15…

Q: In a random sample of seven aerospace engineers, the mean monthly income was $7322 and the standard…

A: Given,sample;  n=7mean;    x¯=7322 $Standard deviation; s=343 $at confidence level 95% ,…

Q: In a random sample of 42 Pa high schools it is found that the average number of students is 279.…

A: Given: n=42, x=279 and σ2=206. The value of z at 93% confidence level is 1.81.

Q: The manager of a fast-food restaurant wishes to estimate the mean waiting time customers spend at…

A: It is given that the sample size is n=56. The sample mean waiting time is x¯=6.35. The sample…

Q: In a random sample of six cell phones, the mean full retail price was $432.00 and the standard…

A: Given: The population is normally distributed. Sample mean, x=432 Standard deviation, s = 203 Sample…

Q: A random sample of 42 business students required an average of 43.4 minutes to complete a statistics…

A:

Q: A reacher has collected the blood samples of 29 individuals and found that the mean hemoglobin…

A: Given:

Q: What is the 90% confidence interval for the variance of exam scores for 28 algebra students, if the…

A: Obtain the 90% confidence interval for the variance of exam scores. The 90% confidence interval for…

Q: A random sample of 300 Kentucky students showed a mean combined SAT score of 1758 with a standard…

A: given that,mean(x)=1758standard deviation , s.d1=213number(n1)=300mean(y)=1725standard deviation,…

Q: A professor measured her own blood pressure 25 times and found the sample mean to be 128.52, and…

A:

Q: A statistician chooses 27 randomly selected dates, and when examining the occupancy records of a…

A: Givensample size(n)=27Variance(s2)=34.34conidence level=95%

Q: A sample of 22 public high school students spent an average of 6.5 hours studying per week. Assuming…

A: Given: Sample Sizen=22Sample MeanX=6.5Standard Deviationσ=2.3 The z value corresponding to…

Q: In a random sample of twelve cell​ phones, the mean full retail price was ​$566.50 and the standard…

A:

Q: A study by the department of education of a certain state was trying to determine the mean SAT…

A: From the provided information, Sample size (n) = 77 Mean score (x̅) = 515 Standard deviation (s) =…

Q: A simple random sample of 35 cars and trucks in Vermont have a mean price of $18,702 with a standard…

A: In this question, we have given information35 cars and trucks in Vermont have mean $18702 and…

Q: In a sample of 32 students, the mean scholarship amount received was $887, with a standard deviation…

A: Given information: n=32x¯=887s=27.4 df=n-1=32-1=31 Confidence level is 90% Significance level is…

Q: A food snack manufacturer samples 11 bags of pretzels off the assembly line and weighs their…

A:

Q: A researcher is conducting a study to determine the mean trough dosage of medication for a…

A: It is given that the standard deviation is 40, sample size (n) is 350 and the level of confidence is…

Q: In a random sample of eleven cell phones, the mean full retail price was $416.00 and the standard…

A:

Q: In a sample of 56 tax returns filed by local hotel managers in a recent year, the taxable incomes…

A: Given: n=56 Mean= 41225 Standard deviation = 6112

Q: A random sample of 550 credit-card holders shows that the mean annual credit-card debt for…

A: Given information   Sample size (n) = 550 Mean x̅  = $8220 Standard deviation (s) = $1102…

Q: The manager drew a sample of 30 delivery time in June and found that the mean delivery time is 17…

A:

Q: A group of 40 bowlers showed that their average score was 192 with a standard deviation of 8. Find…

A: Given: n = 40 x¯ = 192 σ = 8 confidence level = 95%

Q: A sample of 14 commuters in Chicago showed the average of the commuting times was 33.2 minutes. If…

A: Given that x bar =33.2.s.d =8.3,n=14,alpha=.05

Q: A sample of 50 patients undergoing chemotherapy has a mean weight loss of 24 kg after they went the…

A: For the given data Find 99% confidence interval = ?

Q: A random sample of 250 students at a university finds that these students take a mean of 15.3 credit…

A:

Q: According to a health foundation survey from 2018 and 2016, the average annual premiums for…

A: The provided information is, The confidence level is 97%. Therefore, the level of significance is 1…

Q: argin of

A: Let X be the random variable such that the height of college football players. σ : The population…

Q: In a random sample of seven cell​ phones, the mean full retail price was ​$474.50 and the standard…

A: given that,sample mean, x =474.5standard deviation, s =189sample size, n =7

Q: The monthly advertising expenditure of the company is normally distributed with a standard deviation…

A:

Q: The manager of the service department of a local car dealership has noted that the service times of…

A:

Q: A sample of 50 patients undergoing chemotherapy has a mean weight loss of 24 kg after they went the…

A:

Q: In constructing a 98% confidence interval for the mean of a population with variance 25, how large a…

A: Solution: From the given information, confidence level is 0.98, σ2=25 and E=0.8.

Q: The monthly advertising expenditure of the company is normally distributed with a standard deviation…

A:

Q: In a random sample of seven cell​ phones, the mean full retail price was ​$414.50 and the standard…

A: Given that  Sample Mean \bar XXˉ = 414.50414.50 Sample Standard Deviation (s)(s) = 171171…

Q: A study by the department of education of a certain state was trying to determine the mean SAT…

A: Solution: Let X be the score. From the given information, x-bar=448, s=84 and n=56.

Q: Estimate the average number of feathers that a mature tom turkey has with 90% confidence interval by…

A: It is an important part of statistics . It is widely used .

Q: In a sample of 10 randomly selected black bears from northeast Pennsylvania, the sample mean was…

A:

Q: A study was conducted to estimate hospital costs for car accident victims who wore seat belts.…

A: Using t distribution for calculating confidence interval becauseof unknown population sd.

Q: A sample of 30 Microsoft employees yielded a mean of 44 hours worked per week with a standard…

A: A sample of 30 Microsoft employees are collected. Sample mean number of hours worked per week is 44…