A researcher interested in exercise endurance in older adults with coronary heart disease measured the endurance of 450 older adults during an exercise routine on a scale of 0-10. He obtained a mean (SD) rating of 6.2 (3.4). Compute the 85% C. I:  _____________.

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A: The objective of the question is to find out the change in the expected value of Y when X increases…

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A: We have to find given probability.

Q: A population is normally distributed with a mean of u = 145 and o 20. Which is the percentile rank…

A: According to the given information, we have The distribution is normal. Mean = 145 Standard…

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A: Dependent variable: The dependent variable represents the output based on the values of independent…

Q: A population of scores has mean 80. in this population, a score of X= 86 corresponds to z= +2. what…

A:

Q: If the t-statistic for a variable is -1.74, is the variable statistically significant? No Yes

A: Given: Test statistic is -1.74

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A: The random variable drying times follows normal distribution. We have to construct 95% CI for the…

Q: a sample of n=7 scores has the mean of M=16. One score in the population is changed from X=20 to…

A: The mean is 16 and the sample size n is 7.

Q: A researcher found traits are capable of explaining only 9℅ of the variance in our behavior. This…

A: The objective of this question is to find the correlation coefficient that corresponds to the given…

Q: A sample of n=5  scores has a mean of M=12. If one new score with a value of  X=18 is added to the…

A:

Q: The data for the height of women is approximately bell-shaped. If a woman’s height has a z-score of…

A: Given that  Z-score is -1.3

Q: The data given below are temperature readings from a chemical process in °C, taken every two…

A: The objective of the question is to analyze the given temperature readings from a chemical process…

Q: A study considers whether the mean score μ on a college entrance exam for students in 2007 is any…

A: From the information, the sample mean for 1957 is 500 and the sample mean for 2007 is 497. also, the…

Q: f n=7 scores has a mean of u=13. What is the value of EX

A: The formula of the mean is: Meanμ = ΣX N

Q: Find the lower 2.5th percentile of an F distribution with 14 and 7 df. What symbol is used to…

A: From the provided information, The degree of freedom (d1) = 14 and d2 = 7 2.5th percentile means p =…

Q: Using z-scores, a population with u = 37 and o = 6 is standardized so that the new mean is u = 50…

A: Given

Q: study found correlation r=0.43 between high school math grades ( on a 0 to 100 scale ) and income 10…

A: Solution r be the correlation coefficient lies between -1 and 1.

Q: calculate the standard score of the given x value x=36.5 where u= 36.5 and a=36.7

A:

Q: Recent results suggest that children with ADHD tend to watch more TV than children who are not…

A: Given Information- Sample size, n = 36 Sample mean, x-bar = 4.9 hours Population mean, μ = 4.1…

Q: A sample from a normal population with u=50 and o =6 has a mean of M =48.20.If the sample mean…

A: Given,mean(μ)=50standard deviation(σ)=6sample mean(M)=48.20z-score =-1.50

Q: Suppose the mean of Z is 2. What is the mean of Y if a = 1.22 and Y=aZ?  (Use two decimal places,…

A: Suppose the mean of Z is 2. What is the mean of Y if a = 1.22 and Y=aZ? (Use two decimal places, ex:…

Q: a population of scores has u=44. in this population a score of x=40 corresponds to z = -1.00. What…

A: We have given that, Population mean (u) = 44, raw score of population (X) = 40 and z- score = -1. 00…

Q: a population with a mean of u=45, a score of X=54 corresponds to z=1.50. What is the population…

A: Given data,Mean μ=45X=54z=1.50Sd σ=?

Q: A population of N=5 scores has a mean of μ=8. After one score is removed, the mean is found to be…

A: We have to find given missing score.

Q: For a data set of the pulse rates for a sample of adult females, the lowest pulse rate is 39 beats…

A: Note: Hey, since there are multiple subparts posted, we will answer first three subparts. If you…

Q: You perform a one-sample t test and calculate a t statistic of 3.0. The mean of your sample was 1.3…

A:

Q: An insurance company selected samples of clients under 18 years of age and over 18 and recorded the…

A: Given that, An insurance company selected samples of clients under 18 years of age and over 18 and…

Q: A sample of n=25 scores has a mean of M=68. Find the z-score for this sample: if it was obtained…

A: Sample size = 25 Sample mean = 68 Mean = 60 Standard deviation = 10

Q: A population of scores has u = 50 and o = 5. If every score in the population is multiplied by 3,…

A: If a constant value multiplies to each score in distribution, then the mean and standard deviation…

Q: Assuming that the data are normally distributed, a. Determine the z-score such that the area to…

A: given data standard normal distributionZ~N(0,1)area under standard normal curve represents…

Q: Find two z values, one positive and one negative, that are equidistant (the same distance away) from…

A: Z1=+1.645≈+1.65