The mean test score of a sample of 28 students in a Statistics class is 85, with a standard deviation of 7. a) Construct a 96% confidence interval for the mean test score of Statistics students. Round your answer to 3 decimal places. b) What is the margin of error of this interval? The margin of error is ______ c) Interpret your findings. You can be 96% confident that the population mean is somewhere between 78 and 92, 81 and 90, 82 and 88, or 83 and 85 d) Is the true population mean likely to be an A (90 or more)? Yes or no

Q: In a multiple-choice examination in Chemistry, students Mae and Julie received scores of 82 and 65,…

A: We have given that.   X~N( μ , ?^2 )   μ = , ? =   Z-score =( x - μ )/?

Q: Which of the following could we find by examining a boxplot for a set of data?: I. mean II. median…

A: Given that, Which of the following could we find by examining a boxplot for a set of data?

Q: Which of the following are measures on positions of a data set? 1. the third qurtile 2. the median…

A: The third quartile, the median and the maximum measures the positions of a data set.

Q: 00 freshmen at Arundel University took part in a math comprehension test. The scores were normally…

A: The middle (center) of the normal curve represents the mean of the curve. The normal curve is the…

Q: A class of 30 62.171 students took a quiz worth 50 points. The standard deviation of the scores was…

A: Standard deviation of sample is given by

Q: Five students took a personality test. Their deviation scores were –4, +3, +1, –2, +2. Assuming that…

A: We have given the following deviation scores were –4, +3, +1, –2, +2 coming from a normal…

Q: Tom scored a 117 on a measure of math ability and a 41 on a measure of verbal ability. The means and…

A:

Q: Use z scores to compare the given values.   The tallest living man at one time had a height of 221…

A:

Q: Find the mean, median, and mode for the given data. B. Does it appear that the data is skewed or…

A: The sample size is .The observed number of M&M's in each bag is given as…

Q: What is the Z value for a value of X = 60?

A:

Q: Of the 500 people who took the civil servant acceptance test in one government agency, the average…

A: We have given that  Mean=67.5 Standard deviation=5.2  Find A) P(55.6<x<61)B) P(x>65)

Q: In a study to compare the IQ between boys and girls in a particular elementary school, a random…

A: In this context, the statistical summary of the IQs of the boys and girls is given. Based on the…

Q: s known that o = 2.15 pounds. %3D sample should be taken to be 93% confident that the sample mean is…

A: The sample size can be calculated as: n=z×σE2 Here, z = desired confidence level E = The allowable…

Q: For a population, a deviation score is computed as X – σ.

A: What is Deviation score ? Deviation score is basically a degree of score from which a raw score is…

Q: Thirty randomly selected students took the calculus final. If the sample mean was 74.2 and the…

A: From the provided information, Sample size (n) = 30 Sample mean (x̅) = 74.2 Standard deviation (s) =…

Q: Suppose that the distribution of Writing SAT scores from your state this year is normally…

A: Given,For male, mean (μ) =480 and standard deviation (σ) =110.For female, mean (μ) =500 and standard…

Q: Suppose that the true mean speed of cars in the school zone is actually 15 mph and the speeds we…

A: as the speed of cars in being measured in terms of the average, the parameter of interest is given…

Q: Cattle The Virginia Cooperative Extension reportsthat the mean weight of yearling Angus steers…

A: The mean and the standard deviation are 1,152 and 84 pounds, respectively.

Q: Suppose that you are conducting a survey on how many pets each employee has in his or her household.…

A: Suppose that you are conducting a survey on how many pets each employee has in his or her household.…

Q: The standard deviation of a data set is zero. This means that a. All the values are equal to zero b.…

A:

Q: Use the Empirical Rule to find the number of scores falling into each of the following intervals: a.…

A: The Empirical rule says that for bell- shaped distribution,  About 68% of observations lie within 1…

Q: A statistics class of 40 students took a quiz. The highest possible score was 4 points. 10 students…

A: Given that there are 40 students took a quiz. 10 students scored 4 points, 12 students scored 3…

Q: 99% confidence interval for the mean of entire student.

A:

Q: Tom scored a 122 on a measure of math ability and a 39 on a measure of verbal ability. The means and…

A:

Q: A sample of students  in a  college  take a statistics test has a mean score of 78.2 ,a mode of 67,…

A: Given : Mean = 78.2 Mode = 67 Median = 67

Q: Five students took a self-confidence test. Their deviation scores were –4, +3, +1, –2, and +2.…

A: Given ,deviation scores were –4, +3, +1, –2, and +2

Q: You have a sample of 48 randomly selected Vancouverites. On average (the sample mean), the people in…

A: Given information: Minimum = 367 Maximum = 484 x¯=425, n=48

Q: Two classes were given identical quizzes. Class A had a mean score of 8.7 and a standard deviation…

A: The mean score for Class A is 8.7 and the mean score for Class B is 7.8. That is, the mean score for…

Q: The Graduate Record Examinations are widely used to help predict the performance of applicants to…

A: X follows a Normal distribution with mean = 544 and S.D = 103 Then z=(x-mean)/SD = (x-544)/103…