It currently takes users a mean of 5 minutes to install the most popular computer program made by RodeTech, a software design company. After changes have beenmade to the program, the company executives want to know if the new mean is now different from 5 minutes so that they can change their advertising accordingly. Asimple random sample of 46 new customers are asked to time how long it takes for them to install the software. The sample mean is 4.7 minutes with a standarddeviation of 1.l minutes. Perform a hypothesis test at the 0.10 level of significance to see if the mean installation time has changed.Step 2 of 3: Compute the value of the test statistic. Round your answer to three decimal places.AnswerE TablesE KeypadKeyboard Shortcuts

Given data : sample size, n = 46 sample mean, x̄ = 4.7 sample standard…

Answered: simple random sample of 46 new…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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How often do people who live near the beach actually visit the beach? A random sample of 25 residents in a coastal town revealed that the residents visited the beach 28.1 days a year on average. The standard deviation of the sample is 5.5 days. We wish to use the data to estimate the average number of days in a year that all coastal dwellers visit the beach. a. Find the point estimate for the mean number of days at the beach. b. What is the standard error for the sample mean? c. Find the multiplier for a 95% confidence interval for the mean. d. State the margin of error. e. Construct and interpret the 95% confidence interval for the mean number of days coastal dwellers visit the beach each year.
You are conducting a study to see how much high school students spend on back to school shopping. You first need to determine how many high schoolers to survey. Based on a study done last school year, you believe the population standard deviation is approximately o = 60.7 dollars. You would like to be 90% confident that your estimate is within 1 dollar(s) of average spending on back to school shopping. How many high school students do you have to sample?
Calculate the z-score for the largest value and interpret it in terms of standard deviations. Do the same for the smallest value N: 50 Mean:28.766 SE Mean: 0.476 St.Dev: 3.369 Min: 21.300 Q1: 26.375 Median: 29.400 Q3: 31.150 Max: 35.100
In a paired samples t test, you calculate the standard deviation for the _______. 1 - population scores 2 - difference scores 3 - sample scores 4 - average scores
K Assume that adults have IQ scores that are normally distributed with the top 75%. (Hint: Draw a graph.) mean of 98.9 and a standard deviation 22.5. Find the first quartile Q₁, which is the IQ score separating the bottom 25% from The first quartile is. (Type an integer or decimal rounded to one decimal place as needed.)
K A commuter tallied the time to work for 200 days and found that it resembled a normal curve. The mean time was 50 minutes, and the standard deviation was 2 minutes. For the 200-work-day experiment, find the percent of time commuting to work less than 44 minutes. 44 Minutes to Commute to Office 1 46 48 68%- 95% 99/7% 50
The temperature for P82 is approximately nothing
K Assume that adults have IQ scores that are normally distributed with the top 75%. (Hint: Draw a graph.) mean of 97.6 and a standard deviation 15.8. Find the first quartile Q₁, which is the IQ score separating the bottom 25% from The first quartile is. (Type an integer or decimal rounded to one decimal place as needed.)
According to the National Association of Realtors, it took an average of three weeks to sell a home in 2017. Data for the sale of 40 randomly selected homes sold in Greene County, Ohio, in 2017 showed a sample mean of 3.6 weeks with a sample standard deviation of 2 weeks. Conduct a hypothesis test to determine whether the number of weeks until a house sold in Greene County differed from the national average in 2017. Round your answer to four decimal places. p-value = Use a = 0.05 for the level of significance, and state your conclusion. I. Reject Hn. There is a statistically significant difference between the national average time to sell a home and the mean time to sell a home in Greene County. II. Reject Hn. There is not a statistically significant difference between the national average time to sell a home and the mean time to sell a home in Greene County. (II. Do not reject Ho. There is a statistically significant difference between the national average time to sell a home and the…
Scores on an aptitude test are normally distributed with a mean of 960 and standard deviation of 120. Use the Cumulative Z-Score Table to answer the following questions. Write your answer rounded to the nearest whole number. If 1,570,000 students take the test.. how many would you expect to score above 1224? students ...how many would you expect to score above 972? students ...how many would you expect to score between 972 and 1224? students
A Gallup poll wants to determine the mean number of books Americans read each year. How many subjects are needed to estimate the average number of books Americans read with a margin of error of 0.58 books with 80% confidence? Initial results of the Gallup poll indicate that the population standard deviation is 5.5 books. Round your answer up to the next integer. Question Help: D Video Submit Question P Type here to search
Consider the given data set. n = 12 measurements: 9, 8, 1, 5, 5, 7, 5, 6, 8, 7, 2, 0 Find the mean. USE SALT Find the standard deviation. (Round your answer to four decimal places.) z = Find the z-score corresponding to the minimum in the data set. (Round your answer to two decimal places.) Find the z-score corresponding to the maximum in the data set. (Round your answer to two decimal places.) z = Do the z-scores indicate that there are possible outliers in the data set? Since the z-score for the larger observation is larger than 2 in absolute value, the larger value is unusually large. Since both z-scores exceed 2 in absolute value, both of the observations are unusual. Since neither z-score exceeds 2 in absolute value, none of the observations are unusually small or large. Since the z-score for the smaller observation is larger than 2 in absolute value, the smaller value is unusually small.

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