< Find the critical value Zx/2 that corresponds to the confidence level 85%. Za/25 (Round to two decimal places as needed.)

Q: A study found the lengths of daily driving time for people in your district are Normally distributed…

A: The mean is 35 minutes and the standard deviation is 3.

Q: The percent of fat calories that a person in America consumes each day is normally distributed with…

A: Let X denote the percent of fat calories that a person in America consumes each day is normally…

Q: Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100 and standard…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 269 days…

A: Let X be the random variable from normal distribution with mean (μ) = 269 days and standard…

Q: would be content with 95% confidence. How does the decrease in confidence affect the sample size…

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Q: mean diastolic blood pressure for a random sample of 100 people was 99 millimeters of mercury. If…

A: From the provided information,Confidence level = 90%

Q: Az-score of z = +1.00 indicates a position in a distribution Above the mean by 1 point. Above the…

A:

Q: The combined SAT scores for the students at a local high school are normally distributed with a mean…

A: It is given that the SAT scores follow normal distribution with mean 1536 and standard deviation…

Q: Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 169…

A: Given, Noise levels at various area urban hospitals were measured in decibels. The noise level in…

Q: The combined SAT scores for the students at a local high school are normally distributed with a mean…

A:

Q: A laboratory tested 25 chicken eggs and found that the mean amount of cholesterol was 225 milligrams…

A: Confidence interval when population standard deviation is not known:The formula of confidence…

Q: wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are…

A:

Q: Pat's z-score on an exam is -1.23. In a normally distributed population with u of 25 how many…

A: Provided information is ; Pat's  z-score = -1.23 population mean(μ) = 25  we know that ; z-score…

Q: Scores on a standardized exam are known to follow a normal distribution with a standard deviation…

A:

Q: Scores on a history test have a get age of 55 with standard deviation of 10. What is the z-score for…

A: GivenMean(μ)=55standard deviation(σ)=10student earned score on test(x)=95

Q: Suppose the data represent the inches of rainfall in April for a certain city over the course of 20…

A: From the provided information,n = 20

Q: group of 10 students from elementary school has their height measured. The sample mean is 166 cm and…

A:

Q: he combined SAT scores for the students at a local high school are normally distributed with a mean…

A: Given: μ=1475, σ=306 Let X = minimum score that college includes in its admission requirements =…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days…

A: Mean=263Standard deviation=14

Q: The combined SAT scores for the students at a local high school are normally distributed with a mean…

A:

Q: A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many…

A:

Q: A hospital administrator wants to estimate the proportion of patients whose hospital stay exceeds a…

A: From the provided information, Margin of error (E) = 0.04 Confidence level = 98%

Q: To qualify for a police academy, applicants are given a test of physical fitness. The scores are…

A: Given : mean (μ ) = 62 standard deviation (σ) = 7                                  σ²  = 49

Q: find standard deviation if range is 3.

A: Given: Range = 3

Q: A random sample of gasoline prices in 30 gas stations gives the following statistics: y =$1.29, s…

A: Given  n=30, s=0.16, ȳ=1.29  Find 95% CI for population mean μ

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 261 days…

A: Given Data Population Mean,μ = 261 Population Standard Deviation,σ = 13

Q: Today, the waves are crashing onto the beach every 6 seconds. The times from when a person arrives…

A: Solution: 1. If X be the uniform random variable, then the probability density function of X is Let…

Q: A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many…

A:

Q: A random sample of 40 professional basketball players indicated the mean height to be 6.45 feet with…

A: Given that  x̄ = 6.45 , s = 0.31 , n = 40 95% confidence interval

Q: There are 200 60-year old women with glaucoma that had their blood pressures (BP) taken. The mean BP…

A: As the population standard deviation is not known, we will use t distribution. The number of degrees…

Q: ress the confidence interval (30%,43.2%)(30%,43.2%) in the form of ˆp±MEp^±ME. ___% ± ___%

A: Given Confidence interval is (30%,43.2%)Lower limit=30%Upper limit=43.2%Express in form of p±E

Q: a standardize exam scores are normally distributed,in a recent year,the mean test scores was…

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Q: Measuring the height of a California redwood tree is very difficult because these trees grow to…

A: 1.The 95% confidence interval estimate of the population slope between the height of the redwood…

Q: You are performing a two-tailed test with test statistic z = -2.003, find the p-value accurate to 4…

A: Given, Test statistic value, z = -2.003 Two-tailed test.

Q: The combined SAT scores for the students at a local high school are normally distributed with a mean…

A: Given μ=1515 and σ=304   Use standardization, z=x-μσ

Q: The combined SAT scores for the students at a local high school are normally distributed with a mean…

A: Below is the solution

Q: a laboratory tested 36 chicken eggs and found that the mean amount of the cholesterol was 230 mg…

A: