Type only the upper interval by using  type your answer to the nearest hundredths place.

Q: When Morgan runs the 400 meter dash, her finishing times are normally distributed with a mean of 81…

A: From the information, given thatLet X denotes the finishing times which follows normal distribution…

Q: n = 260 and X = 208, construct a 90% confidence interval for the population proportion, p. Give…

A: Given data,x=208n=260p^=xn=208260=45=0.80

Q: A study of a local high school tried to determine the mean number of text messages that each student…

A: In question, Given that A study of a local high school tried to determine the mean number of text…

Q: A sample of 25 bottles of orange juice were measured and the sample standard deviation is 1.8…

A:

Q: Among those taking the Graduate Record Exam, 18 people are randomly selected. This group had a mean…

A: n = 18 s =140 mu = 550

Q: Calculate the sample median, mean, variance, standard deviation, standard error, and 95% confidence…

A: Mean is the average of all the observation in the sample. Median is the middle value which separate…

Q: A recent study investigated tractor skidding distances along a road in a forest. The skidding…

A: State the hypotheses. That is, there is no evidence that the mean skidding is less than 425 meters.…

Q: Russell is doing some research before buying his first house. He is looking at two different areas…

A:

Q: A study of a local high school tried to determine the mean number of text messages that each student…

A:

Q: If n = 230 and X = 184, construct a 99% confidence interval for the population proportion, p.Give…

A: Given data n = 230 x = 184 sample proportion

Q: Suppose that a 92% Confidence Interval for estimating the average heights, in inches, of all college…

A: confidence interval = x ± margin of errorlower limit = x - margin of errorupper limit = x + margin…

Q: Amy is studying the amount of sleep that college students get on class-nights. Earlier sleep…

A: Formula for the sample size needed to estimate a population mean is

Q: A regulation golf ball should weigh 45 grams. A company produces golf balls for the PGA. To help…

A: GivenMean(x)=47.4standard deviation(σ)=8.9sample size(n)=23α=0.005

Q: If n = 180 and X = 144, construct a 90% confidence interval for the population proportion, p. Give…

A: Solution: From the given information, X=144, n=180 and the confidence level is 0.90. The sample…

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Denote μ1, μ2 as the population means number of miles run each week by group runners and individual…

Q: An article in a professional journal reports the z­-score for the study’s sample mean was z = –1.4.…

A: From the provided information,z = -1.4Sample mean (x̄) = 97Sample size (n) = 49Population mean (µ) =…

Q: The scores on a standardized test for 322 students in nontraditional math classes were compared to…

A: We have find given confidence interval..

Q: A 95% confidence interval was found to be (14.312, 21.432). What is the margin of error? ME=

A: Answer: From the given data, 95% confidence interval was found to be (14.312, 21.432) lower limit =…

Q: If n = 330 and X = 264, construct a 95% confidence interval for the population proportion, p.

A: Ans#- From the provided information, Confidence level = 95% Sample size (n) = 330, x = 264 Sample…

Q: A laboratory tested 78 chicken eggs and found that the mean amount of cholesterol was 224 milligrams…

A:

Q: If n = 250 and X = 200, construct a 99% confidence interval for the population proportion, p. Give…

A: As given, n = 250 and x = 200.  It is asked to construct a 99% confidence interval for the…

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

A: Given Mean = 182.9 Standard deviation=121.8 n=54

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: From the provided information,

Q: A study of 64 bolts of carpet showed that their average length was 75 yards. The standard deviation…

A:

Q: Here are summary statistics for randomly selected weights of newborn girls: n = 250, x= 32.4 hg, s=…

A: The following information has been provided: The sample size is n=20. The sample mean is x¯=32.5.…

Q: Nabisco claims that Chip Ahoy Cookies have an x ̅=28.67 chocolate chips per cookie with a SD=2.67.…

A: The formula for calculating standard error is  SE = σ/√n

Q: The average score for 100 teenagers playing a certain computer game was 80,000 points per player. If…

A: Here we need to construct a 68% confidence interval for the mean score of all teenagers. Given…

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

A:

Q: Provide an appropriate response. Determine the sample size required to estimate the mean score on a…

A: Solution: From the given information, confidence level is 0.90, S=15 and E=4.

Q: A recent survey of 8 social networking sites has a mean of 13.1 million visitors for a specific…

A: We ignore million while calculation.

Q: A very wise teacher measured brain activity in all 20 seniors in his Statistics class in the first…

A: We have to find p value for given testing.

Q: One​ year, the mean age of an inmate on death row was 40.7 years. A sociologist wondered whether the…

A:

Q: Noise levels at various area urban hospitals were measured in decibels. The mean noise level in  69…

A: We want to find 96% CI for population mean μ

Q: A recent survey of 8 social network sites has a mean of 13.1 million visitors for a specific month.…

A: Given that, Mean = 13.1 Standard deviation = 3.1 Sample size = 8

Q: Scott wants to find a 95% confidence interval for the average GPA for Allegany College of Maryland…

A:

Q: A large super market chain is doing market research in the City of Long Beach to determine whether…

A: Hypothesis test are used to measure the mean significance between the sample and population. If the…