How are schools doing? The nonprofit groupPublic Agenda conducted telephone interviews withthree randomly selected groups of parents of highschool children. There were 202 black parents, 202Hispanic parents, and 201 white parents. One ques-tion asked was "Are the high schools in your state do-ing an excellent, good, fair, or poor job, or don't youknow enough to say?" Here are the survey results:¹+ExcellentGoodFairPoorDon't knowTotalBlackparents19226752422202Hispanicparents3455612428202Whiteparents2281602414201 How are schools doing? Refer to Exercise 28. Dothe data provide convincing evidence of a differ-ence in the distributions of opinions about howhigh schools are doing among black, Hispanic, andwhite parents?State appropriate null and alternative hypotheses fora significance test to help answer this question.Calculate the expected counts. Show your work.Calculate the chi-square statistic. Show your work.

The data about high school performance was collected from three groups Black, Hispanic, and White…

Answered: How are schools doing? he nonprofit…

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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Online Medical Info USA Today posted this question on its website: “How often do you seek medical information online?” Of 1072 Internet users who chose to respond, 38% of them responded with “frequently.” What term is used to describe this type of survey in which the people surveyed consist of those who decided to respond? What is wrong with this type of sampling method?
Suppose 500 people in the sample of 1,007 adults were women. Gallup asked these 500 women. "What is your favorite Summer Olympic event?" Thirty-five percent said swimming was their favorite. Gallup gave a margin of error for this result. A) ....Plus or minus 3 percentage points just as for the overall poll B)...greater than plus or minus 3 points becuase the sample for this question is smaller C)...less than plus or minus 3 points because the population of swimming fans is smaller than the population of all adults D)...Less than plus or minus 3 points becuase the sample for this question is smaller
During peak period, customers arrive at random at a fish and chip shop at the rate of 20 customers every 15 minutes. a. Find the probability that during peak period, exactly 15 customers will arrive in the next 15 minutes b. If the probability that more than 10 customers will arrive during 10 minutes of peak period is greater than 80%, the manager will employ an extra shop assistant. Will the manager hire and extra shop assistant?
UTAS, Nizwa has received 400 Red Markers, 600 Black Markers and 1000 Blue Markers. The college store keeper wants to check 50 samples using stratified sampling. Which of the following are the correct samples? a. 25 Red Markers, 15 Black Markers, 10 Blue Markers b. 10 Red Markers, 15 Black Markers, 25 Blue Markers c. 15 Red Markers, 15 Black Markers, 20 Blue Markers d. 10 Red Markers, 25 Black Markers, 15 Blue Markers
You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 95% confident that the sample percentage is within 5.5 percentage points of the true population percentage. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 33% of air passengers prefer an aisle seat. n3= (Round up to the nearest integer.)
a. Are all of the 811 opinions accounted for in the table? Add another category if necessary. b. Create a pie chart to describe the data. c. Create a bar chart to describe the data. d. Rearrange the bars in part c so that the categories are ranked from the largest percentage to the smallest e. Which of the three methods of presentation--part b, c, or d is the most effective?
You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 90% confident that the sample percentage is within 5.5 percentage points of the true population percentage. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 38% of air passengers prefer an aisle seat. (Round up to the nearest integer.)
5.
1250 were surveyed, 911 drank alcohol or used illegal drugs, 425 drank alcohol only. How many drank alcohol and used illegal drugs, but did not smoke cigarettes?
The city of Raleigh has 10500 registered voters. There are two candidates for city council in an upcoming election: Brown and Feliz. The day before the election, a telephone poll of 500 randomly selected registered voters was conducted. 158 said they'd vote for Brown, 293 said they'd vote for Feliz, and 49 were undecided.Give the sample statistic for the proportion of voters surveyed who said they'd vote for Brown. Note: The proportion should be a fraction or decimal, not a percent.
A survey of freshmen revealed the following information: •24 signed up for a math class. • 28 signed up for a biology class. •20 signed up for both biology and math. •2 signed up for neither biology nor math. How many freshmen in total were surveyed? 0 34 O Not enough information were given. O 54 O 74
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