Julia enjoys jogging. She has been jogging over a period of several years, during which time her physical condition has remained constantly good. Usually, she jogs 2 miles per day. The standard deviation of her times is ?=1.8σ=1.8 minutes. She has a random sample of 90 runs. For these 90 times, the sample mean was 15.61  minutes. Find an 80% confidence interval for the population mean time for Julie to run 2 miles.

Q: Suppose that you are interested in determining the average height of a person in a large city. You…

A: Solution: Given information: n= 400 Sample size  x=63 inches Sample mean s= 6 inches Sample standard…

Q: It takes an average of 13.1 minutes for blood to begin clotting after an injury. An EMT wants to see…

A: The population mean or the hypothesized mean is .The sample size is .The sample mean is .The sample…

Q: A random sample of 42 chemists from Washington state shows an average salary of $46283, the…

A: The question is about hypo. testing Given : Randomly selected no. of chemists from "WS"  ( n1 ) = 42…

Q: A standardized​ exam's scores are normally distributed. In a recent​ year, the mean test score was…

A: The mean test score is 1463 and standard deviation is 315. The z-score for 1860 is,…

Q: It takes an average of 8 minutes for blood to begin clotting after an injury.  An EMT wants to see…

A: Given : sample size, n = 54 sample mean, x̄ = 7.3 sample standard deviation,s= 2.0…

Q: A sample with M = 85 and s = 12 is transformed into z-scores. After the transformation, what are the…

A: According to the sum, a sample with M = 85 and s = 12 is transformed into z-scores.M = sample mean=…

Q: The mean wingspan of a sample of 31 birds of a particular species is 30 inches.  The standard…

A: Sample size n =31 Sample mean=30 Population standard deviation =4

Q: It takes an average of 10 minutes for blood to begin clotting after an injury.  An EMT wants to see…

A: Given, population mean,µ = 10 population standard deviation (σ) = 3.5 sample size (n)  = 54 sample…

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A: Unusual value: The Z-value is said to be Unusual if the Z is greater than 2 or less than –2. From…

Q: Of all of the possible samples, what proportion will show an average weight loss? In symbols, what…

A: The proportion would show an average weight loss is, PM<0=PM-μσn<0-964=Pz<-93=Pz<-3 The…

Q: It takes an average of 11.2 minutes for blood to begin clotting after an injury.  An EMT wants to…

A:

Q: It takes an average of 12.6 minutes for blood to begin clotting after an injury.  An EMT wants to…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: study of a population showed that​ males' body temperatures are approximately Normally distributed…

A: We have given that the Mean=98.3, Standard deviations=0.60

Q: researcher in a large university claimed that the mean health care expenses differ from the national…

A: From the given information, Consider,  μ=$1570n=50x=$1680s=$180α=0.05

Q: We have two random variables X and Y. The standard deviation of X is 0.34365 and the standard…

A: r=correlation=0.97 (2 decimal places)

Q: It takes an average of 12.4 minutes for blood to begin clotting after an injury.  An EMT wants to…

A:

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A: GivenMean(μ)=1451standard deviation(σ)=316

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A: Consider a random variable X that denotes the test scores. Therefore , X~Nμ=1527,σ=315

Q: A standardized exam's scores are normally distributed. In a recent year, the mean test score was…

A: From the provided information,Mean (µ) = 1473Standard deviation (σ) = 315X~N (1473, 315)

Q: Beth randomly chose 30 school days and timed her drive to school on those days. Ana randomly chose…

A: Given that  We have to test hypothesis for the claim that Beth’s drive time is greater than…

Q: An experiment was conducted to estimate the effect of smoking on the blood pressure of a group of 31…

A: The sample size is 31, sample mean is 9.1 and sample standard deviation is 5.3.

Q: Two chemical companies can supply a raw material. The concentration of a particular element in this…

A: The population variance of concentration of the element by company 1 is σ12 and the population…

Q: You are interested in learning about the average online hours per day for ABC College students. Data…

A: 1.

Q: duction of 12 male red-winged blackbirds before and after receiving testosterone implants was…

A: given:  d = 0.056  sd = 0.175  probability of 0.8, mean change of 0.01

Q: Your instructor tells you that past average scores for the final exam are 75%. But this semester he…

A: Find the distribution that has to be used to perform hypothesis testing in the given situation:The…

Q: It takes an average of 13.5 minutes for blood to begin clotting after an injury.  An EMT wants to…

A: (1)   Determine what type of test is used for testing for problem.   The type of test is used for…

Q: At one college, GPA's have a roughly bell-shaped distribution with a mean of 3.1 and a standard…

A: Given: Let x be the GPA of students have bell shaped distribution with mean 3.1 and standard…

Q: A particular fruit's weights are normally distributed, with a mean of 751 grams and a standard…

A: Draw the normal curve and shade the area of 0.17 to the right of z under the normal curve. Since…

Q: We have a recent set of data of n=30 Americans, the sample mean = 14 hours per day, the standard…

A: The sample mean and population mean is whether related or not is calculated using the z test when…

Q: t takes an average of 12.9 minutes for blood to begin clotting after an injury.  An EMT wants to see…

A: If the sample standard deviation is unknown and the sample size is small then the t test is used.…

Q: In a survey, the mean weight of 1005 rats was calculated to be 132 gr. The standard deviation of the…

A:

Q: The manager at UPS feels that the weights of packages shipped recently are less than in he past.…

A: Given  Population mean μ=36.7, standard deviations σ=14.2, level of significance=0.01, n=64, sample…

Q: ive a life expectancy of x = 71.5 years with a standard deviation of s, = 6.6 years. A sample of 6…

A: According to guidlines we can strickly answer three subspartsRural town:Sample size Sample mean…

Q: In the year 2033, katy perry is a leading traveling nurse. Katy is interested in reducing the mean…

A: Population mean, μ=8.6 Sample size, n=46 Sample mean, x¯=8.1  Sample sd, s=1.2 α=0.05

Q: From generation to generation, the mean age when smokers first start to smoke varies. A survey of 20…

A: Given Information :  From generation to generation, the mean age when smokers first start to smoke…

Q: A 1995 study shows that since records were first kept in a meteorologist's hometown, the average…

A: Solution: Let X be the temperature during the month of May. From the given information, n=25,…

Q: A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1030 h with a…

A:

Q: A population of scores has µ=44. In this population, a score of X= 40 corresponds to z= - 0. 50.…

A:

Q: For a population with mean of 50 and a standard deviation of 8, what is the Z-score that corresponds…

A: Given:  population mean of random variable x is =50 and standard deviations=8  then find z score…

Q: A homeowner has installed a new energy-efficient furnace. It is estimated that over a year the new…

A: We know that if; X1,X2,...,Xn~Normal(μ,σ2), independently Then; Sn=X1+X2+...+Xn~Normal(nμ,nσ2)