The daily salaries (in dollars) of teachers for 9 local schools are shown. Find the 90% confidence interval of the mean for salaries of teachers. 60 56 60 55 70 55 60 55 63

Q: Q1/ The table below show the spot speed data studies for a highway section. Determine the arithmetic…

A: Corrected CI f x fx fx2 42.45-47.45 42 44.95 1887.9 84861.11 47.45-52.45 123 49.95 6143.85…

Q: Solve for the range, variance, and standard deviation of this data: 40, 34, 50, 46, 47, 39. +Input…

A: We will find out all the required values.

Q: male 9 male 6 male 7 male male 8 male 6 male 8 male 7 male 9 male male 7 male 8 male 5 male 9 male 7…

A: We have given the data on Gender and their hours of sleep. We have to find the mean and standard…

Q: find the standard deviation for the group of data items   stem 1 = 6,7,7,6,5,6 stem 2 = 0,3,2,0

A: The objective of this question is to calculate the standard deviation of a group of data items. The…

Q: QUESTION 6 Given an x-mean of 15 and a y-mean of 12.2, calculate the crossproduct of x=15 and y=8.

A: When x=15 and y=8 Crrosproduct =x*y = 15*8

Q: survey to determine if the percentage of adults who use social media has changed from 52%, which was…

A: The sample proportion is computed as follows, The critical value for 96% confidence level, i.e.,…

Q: The Scholastic Aptitude Test (SAT) has two parts: Reading and Writing and Mathematics. Scores on…

A:

Q: Listed in the data table are IQ scores for a random sample of subjects with medium lead levels in…

A: The data shows the IQ scores for a random sample of subjects with medium lead levels and high lead…

Q: Find  Variance and Standard deviation for the following data.  4,  4,  7,  11,  14.

A: Given sample xi is:  4, 4, 7, 11, 14  Sample size, n = 5   Sample mean can be calculated as:…

Q: Q4/ Calculate the Quartile Deviation (Q.D) and coefficient of Q.D. for the data: Class 10-20 20-30…

A: The provided data is: Class interval Frequency Cumulative frequency(cf) 10-20 5 5 20-30 8…

Q: Here is a data set. 0,1,1,2,3,5,8,13 Use the table method and find the standard deviation.

A: Given numbers 0,1,1,2,3,5,8,13

Q: In a randomized comparative experiment on the effect of calcium in the diet on blood pressure,…

A: The sample standard deviation is 9.1, and sample size is 25.

Q: Justin got a score of 85 on an GE MMW examination for which the mean is 75. Justin realized that the…

A: Given:Here use the formula;here,  represents the value of Standard Daviation.

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: From this given data set: 13,14,15,16,12,17,16,15,12,13 What is the measure of dispersion for…

A: The data in ascending order is 11, 12, 13, 13, 14, 15, 15, 16, 16, 17. The position of the first…

Q: A commonly used standardized test in psychology research is designed so that the mean score of all…

A: From the provided information, Mean (µ) = 140 Standard deviation (σ) = 20 X~N (140, 20) Here X be a…

Q: Assume a new measure of Intelligence Quotient (or IQ) has been developed. The mean IQ for the…

A: The standard deviation is defined how much deviation from the mean is called standard deviation.

Q: What is the percentile rank of the score 65?   In an English test , the mean is 60 and the…

A: Given X=65μ=60σ=6

Q: Suppose your statistics professor gave six examinations during the semester. You received the…

A: Given the scores:79,84,82,82,84,77

Q: You are given that mean = 50, coefficient of variation = 40% and coefficient of skewness = – 0.4.…

A: Given, Mean = 50, Coefficient of Variation (CV) = 40% Coefficient of skewness = - 0.4.

Q: The entering SAT scores and high school GPA’s of 100 first-year students and their grade point…

A: The entering SAT scores and high school GPA’s of 100 first-year students and their grade point…

Q: Two classes were given identical quizzes. Class A had a mean score of 7.5 and a standard deviation…

A: Given : Class A had a mean score of 7.5 and a standard deviation of 0.8 Class B had a mean score of…

Q: The Peabody  Picture Vocabulary Test has a standard score population mean of 100 and a standard…

A: The Peabody  Picture Vocabulary Test has a standard score population mean of 100 and a standard…

Q: Let’s assume that weight is normally distributed with a mean of 160 and a standard deviation of 25…

A: Step-by-step procedure to obtain the middle 80% 0f all people lie between which two weights using…

Q: The ages (in years) of a random sample of shoppers at a gaming store are shown. Determine the range,…

A: Solution

Q: A commuter tallied the time to work for 200 days and found resembled a normal curve. The mean time…

A:

Q: The mean GPA for 50 students was 3.02 and the standard deviation was 0.3. Assume that the…

A: The mean GPA for 50 students was 3.02 and the standard deviation was 0.3. Also, the distribution of…

Q: The 95% confidence interval of the variance of a population is computed as (12.367,21.761).…

A: Given information: The 95% confidence interval for the variance of a population is (12.367, 21.761).…

Q: The average number of newspapers for sale in an airport newsstand is 12 and the standard deviation…

A: In the given problem we have given that, the average number of newspapers for sale in an airport…