The average hour spent in computer by 20 senior high school students during online class is 7 hours with a standard deviation of 2 hours. Construct a 98% confidence interval of the average hour spent by all senior high school students. Identify the width of the interval.

Q: You want to estimate the mean weight of quarters in circulation. A sample of 60 quarters has a mean…

A: n=60    x=5.632    S=0.066    95%  CI for  μ

Q: Q1. The test scores on a test were recorded for 8 students as follows: 71, 93, 91, 86, 75, 73, 86,…

A: Given that,The test scores on a test were recorded for 8 students as follows,71, 93, 91, 86, 75, 73,…

Q: ​Clearly one would assume that private colleges and universities would have a higher annual total…

A: Given information: The data represents the values of annual total cost of private school and public…

Q: Hospital Noise Levels For a sample of 22 operating rooms taken in a hospital study, the mean noise…

A:

Q: A simple random sample of 40 observations has a mean of 25.  The population standard deviation, σ =…

A: Given values, sample size (n) = 40 Mean = 25 Standard deviation = 5

Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

A:

Q: The time a patient must wait before being attended by a physician in a hospital has been observed…

A: Hypothesis Testing: It is basically a comparison of the statistical measures of the data with one…

Q: If all other factors are held constant, how does an increase in standard deviaton influence the…

A: Let n be the sample size. Let x¯ be the sample mean. The standard deviation is calculated as:…

Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…

A: It is given that the mean is 264.3 and the standard deviation is 0.5.

Q: 38. A student wanted to construct a 95% confidence interval for the mean age of students in her…

A:

Q: We randomly sample 300 people in a specific town. 96 of them like cats. Based on this, construct a…

A: The provided information are: Sample size=n=300 Number of favroable cases==x=96 to Construct the 95%…

Q: The operations manager of a production plant A would like to estimate the mean amount of time a…

A: In this problem, we are asked to estimate the mean amount of time a worker takes to assemble a new…

Q: Suppose you wanted to determine if your new medication improved cholesterol levels in men between…

A:

Q: Translate the statement into a confidence interval. Approximate the level of confidence. In a survey…

A:

Q: The average measured verbal IQ (IQV) scores of children is 100.  In a sample of 20 children, the…

A: The objective of this question is to calculate the 98% confidence interval for the true mean IQV of…

Q: Researchers are interested in determining whether iPhone users rate social media involvement less…

A: It is given that Sample size n = 70 Sample mean = 18 Population SD = 10

Q: The confidence interval lower limit and upper limit for a population mean are (62.3, 67.3). What is…

A:

Q: Exam results have a normally distributed score with a standard deviation of 6. The sample mean for a…

A: The following information has been given: The population standard deviation is σ=6. The sample size…

Q: The mean number of English courses taken in a two-year time period by male and female college…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: Researchers obtained the body temperature of 50 healthy humans and found the average body…

A: Given data,n=50x=98.4σ=0.97The 90% confidence interval is Zc=1.645

Q: One hundred men and one hundred women are surveyed to determine if the percent of women that lie…

A: Given that, One hundred men and one hundred women are surveyed to determine if the percent of women…

Q: Robert finished a triathlon in 64.5 minutes. Among all men in the race, the mean finish time was…

A: formula for z-score is

Q: A toy store would like to open a new store in the city of Thousand Oaks, and they would like to know…

A: Given information Total Households(n) = 600 No of Households having kids(x) = 148

Q: A toy store would like to open a new store in the city of Thousand Oaks, and they would like to know…

A: Obtain the 95% confidence interval for the true population proportion of Thousand Oaks households…

Q: I want to estimate the population mean number of times the average pet owner gives their pet(s)…

A: Obtain the 95% confidence interval for the population mean. The 95% confidence interval for the…

Q: toy manufacturer wants to see how long, on average, a new toy captures children's attention. He…

A: The sample size is .The sample mean is .The sample standard deviation is .The confidence level is .

Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…

A: Find z-value (z): Use excel formula "=NORM.S.INV(0.94)" to find the z-score.

Q: Brown measured his book using a different shaped ruler. He got different measurements, namely 30,…

A: Given that  Different measurements he got 30 , 35 , 29 , 33 , 32 , 28 , 28 , 35 Sum of data value =…

Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…

A: Solution: Let X be the length of the steel rod. From the given information, X follows normal…

Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…

A: Obtain the P31 the average length separating the smallest 31% bundles from the largest 69% bundles…

Q: Construct a confidence interval suitable for testing the claim that students taking nonproctored…

A: A study was done on proctored and non-proctored tests. It is claimed that, students taking…

Q: xplain what happens to the range of values of the Interval Estimate when using different Confidence…

A: The confidence interval is the sample estimate with margin of error.   Keeping the standard error…

Q: market researcher collects a simple random sample of customers from a population of over a million…

A: Population mean (µ)=16 Confidence interval =(17, 55)  We have to conclude that population mean lies…

Q: The table provides summary statistics on highway fuel economy of cars manufactured in 2012 (from…

A: Given data:Hwy MPG, Automatic (consider sample-1)Hwy MPG, Manual (consider sample-2)Mean;…

Q: help please  A shareholders' group is lodging a protest against your company. The shareholders…

A: Given data is,n=66sample mean(x)=10.1standard deviation(s)=5.5α=0.05Null alternate hypothesis…

Q: Among various ethnic groups, the standard deviation of heights is known to be approximately three…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: Choose the correct option and proof the reason why you choose that one and give the evidences.…

A: 1. **Type of Estimate:**  - The confidence interval provided is (-0.31, 0.49). This interval…

Q: A collegiate long jumper is hoping to improve his distance with improved conditioning. His new…

A:

Q: Jack is a college athlete who has been weighing himself weekly on the same scale in the athletic…

A: From the provided information, Population standard deviation (σ) = 3 Sample size (n) = 9 Confidence…

Q: The distance a basketball player runs during a game is one of the many variables used for assessing…

A:

Q: Construct a 95% confidence interval for the mean number of books people read. (_,_)

A: given,mean(x)=14.3standard deviation(s)=16.6sample size (n)=10degrees of…

Q: Please do not use chatgpt, avoid using it completely, because it does not do the math well, do it by…

A: Step 1:To determine whether the director should reject the null hypothesis (μ1​=μ2​​) in favor of…

Q: Estimation of parameters   The average hour spent in computer by 20 senior high school students…

A: 98% confidence interval for μ is given as : x¯±t0.022,19×sn Where x¯=7, S = 2, n = 20,…

Q: Please do not use chatgpt, avoid using it completely, because it does not do the math well, do it by…

A: To determine whether the director should reject the null hypothesis (\mu_1 = \mu_2) and accept the…