Fast Motels, a motel company wants to estimate the average age in years of motel guests with a margin for error of 3.5 years at 95% confidence. Johnny assumes to standard deviation in age of guests is 7.5 years. What sample size should the motel company take?

Q: n this scenario, what is the test statistic? A linguist believes the average age children learn a…

A: Given: n= 21.0 ,x̄= 9.2 ,s= 2.5 µ= 10.0 ,degree of freedom= 20.0

Q: poinitsy The length of time it takes to complete a word puzzle is found to be normally distributed…

A: Note:(1). According to Bartleby expert guidelines, we can answer only first question with their…

Q: What distribution is used in this chapter to make inferences for one population standard deviation?

A:

Q: Farm Sizes. The average farm size in the United States is 444 acres. A random sample of 40 farms in…

A: From the provided information, Sample size (n) = 40 Sample mean (x̄) = 430 Population standard…

Q: if a sample n = 16, mean = 10.3,standard deviation is 2.6. calculate a 95% confidence interval.

A:

Q: a 95% confidence interval for the mean of diastolic BP in women is 62 to 110mmHg.  What is the…

A: We have given that 95% confidence interval CI = ( 62, 110) Confidence level (c) = 95% = 0.95…

Q: The lengths of pregnancies are normally distributed with a mean of 280 days and a standard deviation…

A:

Q: The margin of error is 6, with a sample standard deviation of 20 and 92% level of confidence. Step…

A: As the population mean is estimated on the basis of sample mean, there must be some error in…

Q: Vhich distribution is used to construct an interval estimate of a population standard deviation?

A: Which distribution is used to construct an interval estimate of a population standard deviation?

Q: statistics test scores were normally distributed with a mean of 81 and a standard deviation of 5,…

A:

Q: Assume that the heights of women are normally distributed with a mean of 65.4 inches and a standard…

A: We have given that  Mean=μ=65.4 Standard deviation=σ=2.7 X~Normal(μ=65.4,σ=2.7)

Q: If you have a population standard deviation of 10 and a sample size of 4, what is your standard…

A: Given,population standard deviation(σ)=10sample size(n)=4

Q: In a survey, 18 people were asked how much they spent on their child's last birthday gift. The…

A: From the provided information, Sample size (n) = 18 Sample mean (x̄) = 35.40 Standard deviation (s)…

Q: In a survey, 17 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: A market researcher wants to estimate the amount of money that a Christmass hopper will spend on…

A:

Q: are normally distributed with a mean of 100 and a standard deviation of 15. What IQ is in the 90th…

A: Kwe have to find out given probabiity..

Q: If research samples 28 college students and wants to compare the sample mean of 8 to the population…

A: From the provided information, Sample size (n) = 28 Sample mean (x̄) = 8 Population mean (µ) = 12…

Q: when designing aircraft cabins, what ceiling height will alow 98% of men to stand without bumping…

A:

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: When a distribution is bell-shaped, approximately what percentage of data values fall within 1…

A: We know that, the empirical rule which is also known as 68-95-99.7 rule.  The Empirical Rule finds…

Q: Data of the weights of 81 pet dogs was collected. The sample mean was 30. The standard deviation is…

A: Here, T - interval is applicable ================= df = n-1

Q: An economist would like to estimate the mean amount of money that a family spends to within $36. If…

A: Given that  Population standard deviation =200 Margin of error =E =36 91% confidence.

Q: A university dean wishes to estimate the average number of hours that freshmen study each week. The…

A:

Q: You would like to estimate the variance and standard deviation for credit scores based on FICO.…

A: Construct the 95% confidence interval estimate for the variance of credit scores Obtain the critical…

Q: If this​ 3-year-old boy grows up to be a man with a height at the same​ percentile, what will his…

A: The population mean is 70 and population standard deviation is 3.

Q: f the class average is 84

A: Here it is given that - Mean (μ) = 84 Standard Deviation (σ) = 5 Let, X be a random variable which…

Q: Steel rods are manufactured with a mean length of 28 centimeters. because because of variability in…

A: Answer:- Given, Mean, µ = 28  Standard deviation, σ = 0.06  Let, X = Length of the steel rods.  So,…

Q: boulder 10k race was 1.78 standard deviations faster than women's average group. 405 women ran ,…

A: Given See the handwritten solution

Q: Suppose the exam average in a class is 55% with a standard deviation of 4. What proportion of…

A: The random variable score follows normal distribution. The population mean is 55.         The…

Q: Calculate the standard error for a sample mean when the population standard deviation is 221.6 and…

A: Given data N = 36 SD = 221.6