rom these data that brown-eyedstudents appear more trustworthy compared to theirblue-eyed counterparts? Test the hypothesis thatthe average scores for the two groups are the same.(Software gives k= 77.3.)7.44 Facebook use in college. Because of Facebook'spopularity among college students, there is a greatdeal of interest in the relationship between Facebookuse and academic performance. One study collected-information on n=at the relationships among frequency of Facebook use,participation in Facebook activities, time spent preparingfor class, and overall GPA.4Students reported preparing for class an average of706 minutes per week, with a standard deviation of526 minutes. Students also reported spending an averageof 106 minutes per day on Facebook, with a standarddeviation of 93 minutes; 8% of the students reportedspending no time on Facebook.1839 undergraduate students to look(a) Construct a 95% confidence interval for the averagenumber of minutes per week a student prepares for class.(b) Construct a 95% confidence interval for the averagenumber of minutes per week a student spends onFacebook. (Hint: Be sure to convert from minutes per dayto minutes per week.)(c) Explain why you might expect the populationdistributions of these two variables to be highlyskewed to the right. Do you think this fact makes yourconfidence intervals invalid? Explain your answer.7.45 Possible hiases? Refer to the previous exercise.

Confidence interval: Since the population standard deviation is unknown, t distribution can be used…

Answered: (a) Construct a 95% confidence interval…

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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A national survey of companies included a question that asked whether the customers like the new flavor of a cola from company A. The sample results of 1000 customers, and 850 of them indicated that they liked the new flavor. The 98% confidence interval on the population proportion of people who like the new flavor is _______________. 0.84 and 0.86 0.83 and 0.87 0.82 and 0.88 0.81 and 0.89
Thanksgiving spending, Part II. Exercise 4.14 provides a 95% confidence interval for theaverage spending by American adults during the six-day period after Thanksgiving 2009: ($80.31,$89.11).(a) A local news anchor claims that the average spending during this period in 2009 was $100.What do you think of her claim?(b) Would the news anchor’s claim be considered reasonable based on a 90% confidence interval?Why or why not? (Do not actually calculate the interval.) Please type clearly so I can follow the steps
Suppose a data set of 4,000 observations (n - 4,000) was analyzed using OLS to examine the factors influencing students' college grade point averages. The regression results are as follows, with standard errors in parentheses: colgpa-1.550 +0.0010 sat-0.03 hspere-0.05 hsize +-0.007 haize (0.00) (0.00006) (0.0007) (0.01) (0.000) where colgpa- GPA in college sat score on the SAT exam hspere -percentile in high school graduating class haize size of graduating class, in hundreds 11-4,000 R-0.254 R²-0.253 -0.45 The predicted college GPA for someone who scored 1,120 on the SAT and graduated in the 27th percentile of his or her 700-person high school graduating class, is Suppose you would like to construct a 95% confidence interval around the expected college GPA for someone with aat 1,120, hapere 27, and haize 7. colga 1853+0.0010 sat (0,01) (0.0000) where colgpa-GPA in college sat0 sat-1,120 0.03 Asperc0-0.05 haize0+ 0.007 haize (0) (0000)
Several years ago, 46% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,055 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,055 surveyed, 488 indicated that they were satisfied. Construct a 90% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed. What are the null and alternative hypotheses? Ho: p (Type integers or decimals rounded to two decimal places as needed.) versus H,:p Use technology to find the 90% confidence interval. We are 90% confident the proportion of parents who had children in grades K-12 that were satisfied with the quality of education the students receive is between and (Type integers or decimals rounded to two decimal places as needed.) What is the correct conclusion? O A. Since the interval does not contain the proportion stated…
Several years ago, 48% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,035 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,035 surveyed, 497 indicated that they were satisfied. Construct a 90% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed. III What are the null and alternative hypotheses? Ho: P = 0.48 versus H₁: p 0.48 (Round to two decimal places as needed.) Use technology to find the 90% confidence interval. The lower bound is The upper bound is (Round to two decimal places as needed.) What is the correct conclusion? QA Since the interval contains the proportion stated in the null hypothesis, there is sufficient evidence that parents' attitudes toward the quality of education have changed. OB. Since the interval does not contain the…
National statistics show that 23% of men (sample 1) smoke and 18.5% of women (sample 2) do. A random sample of 149 men indicated that 64 were smokers , and of 119 women surveyed , 41 indicated that they smoked. Construct a 95% confidence interval for the true difference in proportions of male and female smokers. Select one: O a. -0.032
The first day of baseball comes in late March, ending in October with the World Series. Does fan support grow as the season goes on? Two polls, one conducted in March and one in November, both involved random samples of 1,000 adults aged 18 and older. In the March sample, 49% of the adults claimed to be fans of professional baseball, while 57% of the adults in the November sample claimed to be fans. USE SALT (a) Construct a 99% confidence interval for the difference in the proportion of adults who claim to be fans in March versus November. (Let p₁ be the proportion of people who claim to be baseball fans in March and p₂ be the proportion of people who claim to be baseball fans in November. Use p₁ - P₂. Round your answers to three decimal places.) to
Solve C
A 90% confidence interval for the difference between the proportion of college students who use flash cards for studying and high school students who use flash cards for studying is (0.13, 0.23). Then the Error is +5%. True False
CNN is conducting a poll, and wants to produce a 90% confidence interval for the proportion of all New York residents who favor legalizing recreational marijuana. Of the 602 randomly selected New Yorkers surveyed, 394 were in favor of the initiative. a. With 90% confidence, the proportion of New York residents who favor legalizing recreational marijuana is between BLANK and BLANK. b. Suppose that we survey 602 randomly selected Americans many times, and calculate a confidence interval for each group. About Blank . percent of these confidence intervals will contain the true population proportion of New Yorkers who favor legalizing recreational marijuana, and about BLANK percent will not contain the true population proportion.
Construct a 95% confidence interval for p1 - p2 for a survey that finds 30% of 240 males and 41% of 200 females are opposed to the death penalty. Group of answer choices a.(-0.200, -0.021) b.(-1.532, 1.342) c.(-1.324, 1.512) d.(-0.561, 0.651)

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