In a large lecture class, the professor announced that the scores on a recent exam were normally distributed with a range from 51 to 87. Using the Empirical Rule μ ± 3σ to estimate σ, how many students would you need to sample to estimate the true mean score for the class with 90 percent confidence and an error of ±2?

Q: A population of scores has μ = 44. In this population, a score of X = 40 corresponds to z = −1.00.…

A: Where,

Q: A sample has a mean M = 55. In the sample, a score of X = 48 corresponds to z = -1.20. What is the…

A:

Q: A random sample of 120 students has a test score average deviation of 11.4 find the margin of error…

A:

Q: To estimate the mean height μ of male students on your campus, you will measure an SRS of students.…

A: Given that, Standard deviation= 2.8 You want your sample mean x to estimate μ with an error of no…

Q: A sample of 124 kissing couples were observed, with 44 of them leaning their heads to the left. Use…

A: The test statistic for One sample proportion test is as follows…

Q: Unfortunately, arsenic occurs naturally in some ground water.t A mean arsenic level of u- 8.0 parts…

A:

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: To estimate the mean height μ of male students on your campus, you will measure an SRS of students.…

A: From the provided information, The height of young men are approximately normal with standard…

Q: A nutritionist claims that the mean tuna consumption by a person is 3.1 pounds per year. A sample…

A: Solution: Let X be the tuna consumption by a person. From the given information, n=90, x-bar=2.9 and…

Q: A population of scores has μ = 80. In this population, a score of X= 92 corresponds to z = 5. what…

A: Given: μ = 80 z = 5 X= 92

Q: Unfortunately, arsenic occurs naturally in some ground water.t A mean arsenic level of u= 8.0 parts…

A: We have given that  Sample size n=36 ,xbar = 7.1 ,mu=8bbp ,s=2.2 and level of significance =0.01

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

A: It is given that mean is 98.3 and standard deviation is 0.40.

Q: A research study investigated differences between male and female students. Based on the study…

A: Points on sampling distribution of the sample mean: If the true population distribution of a random…

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: A newspaper article reports that the mean cost for preventative dental care per year is $175 with a…

A: 1)Let µ denotes the mean cost for preventative dental care in your company is different from…

Q: A researcher wishes to see if there is a difference in the manual dexterity of athletes and that of…

A: Given data ,Sample 1                              Sample 2Mean (x1)=87…

Q: A sample has a mean M = 55. In the sample, a score of X = 48 corresponds to z = -1.50. What is the…

A:

Q: Unfortunately, arsenic occurs naturally in some ground water.t A mean arsenic level of u = 8.0 parts…

A: a)   Assume that μ is the population average of arsenic level.

Q: (a) Find a 90% confidence interval for μ 1 <μ< (b) Find a 95% confidence interval for μ <μ< (c) Find…

A: The sample size is 70, the sample mean is 24.1 and the population standard deviation is 3.68.

Q: A nutritionist claims that the mean tuna consumption by a person is 3.3 pounds per year. A sample of…

A: Given,   Sample size = 70 Sample mean = 3.1 Population standard deviation = 1.14

Q: "An electrical firm manufactures light bulbs that have a length of life that is approximately…

A: Solution: option b)0.2177 is right Explanation:

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

A:

Q: According to previous studies, the mean distance each visitor in Greenspan National Park hikes…

A: From the above data  The test statistic  Z=0.339 P value is 0.367 Level of significance =0.10

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: In a population with m=60, a score of X=58 corresponds to a z-score of z=-0.50. What is the…

A:

Q: A sample of n = 8 scores has a mean of M = 16. For this sample, ΣX = 128. Is this true or false?

A: A sample of n = 8 scores has a mean of M = 16. For this sample, ΣX = 128.

Q: A student conducts an experiment on high temperature steel. The student takes an initial set of 20…

A: Given, Sample size = n = 20 Sample mean = x = 660 Sample standard deviation = s = 15.3 x = 600…

Q: A math teacher claims that the mean scores on a math assessment test for fourth grade boys and girls…

A: The provided information is  x¯2=151x¯2=149s1=36s2=34n1=13n2=15α=0.01 a.The null and alternative…

Q: A population of score has μ  = 44. in this population, a score of X = 40 corresponds to z = -0.50.…

A: