O Plot DPlot BPlot A604050-3530-40-2530-20201510105-group 1group 2group 2gop1GroupGropPlot CPlot D506045504035-403030-20-15201010-gop1group 2group 1GropGroupz dnooThe brackets or error bars shown at the top of each bar extendthe error bar extendsabove and below each of the group means. For group 1,units above and below the mean for group 1.nere to searchF2F3DIIF5F4F6F7PrtScnHomeF824F94&Mean Score 7. Displaying sample means and their errorsA researcher is investigating whether a reading intervention program improves reading comprehension for second graders. He collects a randomsample of second graders and randomly assigns each second grader to participate in the reading intervention program or not participate in theprogram. The researcher knows that the standard deviation of the reading comprehension scores among all second graders is o = 13.35.Group 1 consists of ni = 38 second graders who did not participate in the program. Their mean reading comprehension score is Mi = 22.8. Group 2consists of na = 42 second graders who did participate in the program. Their mean reading comprehension score is M2 = 46.1.Of the plots that follow, which best represents a plot of these results?O Plot BO Plot AO Plot CO Plot DPlot APlot B3530goup 1proup 2group 1group 2GropPlot CPlot Dnere to searchF3F4PrtScnHomeF5F6F7F8#3&35

Given: Standard deviation = sigma = 13.35 N1= 38 M1= 22.8 N2= 42 M2= 46.1

Answered: 7. Displaying sample means and their…

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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20) The weight of potato chips dispensed into a 48-ounce bag by the dispensing machine has been identified as possessing a normal distribution with a mean of 48.5 ounces and a standard deviation of 0.2 ounce. What proportion of the 48-ounce bags contain more than the advertised 48 ounces of chips? pick one a .4938 b .0062 c .9938 d .5062
1
A hypothesis regarding the weight of newborn infants at a community hospital is that the mean is 7.1 pounds. A sample of seven infants is randomly selected and their weights at birth are recorded as 6.1, 8.1, 9.1, 10.1, 7.1, 11.1, and 12.1 pounds. What is the sample standard deviation?
According to a November 2014 Winthrop poll, of 852 polled SC residents, 222 of them said they plan to spend less on gifts this holiday season. Suppose 30% of all SC residents will spend less this holiday season. Identify the standard deviation of (all possible) sample proportions for SC resident who will spend less.
20) A student randomly selects 10 paperbacks at a store. The mean price is $8.75 with a standard deviation of $1.50. Construct a 95% confidence interval for the population standard deviation, o. Assume the data are normally distributed.
1. The fuel efficiency of a new model pick-up truck (truck) is measured in miles per gallon (mpg). A company claims that their new truck gets 25 mpg on average. A consumer group thinks the company is lying and claims that the mean mileage for all the trucks is less than 25 mpg. In a random sample, of forty-five of these trucks the mean mpg was 23.3 mpg with a standard deviation of 5.1 mpg. a. Conduct a hypothesis test to test the consumer group's claim at the 5% significance level. Be sure to state you Ho and Ha, your test statistic and p- value, whether or not you reject Ho and whether you support the claim. b. Write a complete sentence describing what a Type I error is in context. c. Write a complete sentence describing what a Type II error is in context.
10. In a study conducted to determine the role that sleep disorders play in academic performance, researcher Jane Gaultney conducted a survey of 503 randomly selected students with a known sleep disorder (such as narcolepsy, insomnia, or restless leg syndrome) and found their mean GPA was 2.65 with a standard deviation of 0.87. Similarly, she randomly selected 1342 students with no known sleep disorders, and found their mean GPA to be 2.82 with a standard deviation of 0.83. You may assume that both population GPA's are normally distributed. Use a significance level of 0.05 to test whether the two groups have different mean GPA's. As a follow-up, construct and interpret a 95% confidence interval for the true difference in the mean GPA's of the two groups. What would be the type I and type II errors for this problem?
Answer.
1. The owner of a gasoline service station wants to study gasoline purchasing habits by motorists at his station. A random sample of 60 motorists during a certain week is selected. The sample mean is 11.3 gallons and sample standard deviation is 3.1 gallons. At the .05 level of significance, is there evidence that the average purchase is different from 10 gallons?
MC Qu. 10-64 Sales at a fast-food restaurant average... Sales at a fast-food restaurant average $6,000 per day. The restaurant decided to introduce an advertising campaign to Increase daily sales. In order to determine the effectiveness of the advertising campaign, a sample of 49 day's sales were taken. The sample showed average daily sales of $6,300. From past history, the restaurant knew that its population standard deviation is about $1,000. If the level of significance is 0.01, have sales increased as a result of the advertising campaign? Multiple Choice Fail to reject the null hypothesis. Reject the null hypothesis and conclude the mean is higher than $6,000 per day. Reject the null hypothesis and conclude the mean is lower than $6,000 per day. Reject the null hypothesis and conclude that mean equal to $6,000 per day.

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