The Principal of SMA Aku Pintar claims that top grade students have better UTBK scoresthan regular grade students. Because the UTBK is conducted in waves, until now there areonly 44 students who have taken the UTBK with the following scores.Class Sample Size Sample Mean Sample Primary SchoolExcellent 85801117Regular 8578072With a 95% confidence level, can the Principal's claim be declared true?

The random variable UTBK score follows normal distribution. There are two independent samples which…

Answered: The Principal of SMA Aku Pintar claims…

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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Similar questions

We survey 1004 teens age 13-19, we record whether or not they have had sex education. 817 respond that they have had some form of sex education. (a) Construct a 99% confidence interval for teens who have not had sex education. (b) How many teens would we have to sample in order to cut the margin of error in half?
In a sample of 624 applicants to the Durmstrang Institute of Sorcery, 133 were accepted. Construct a 90% confidence interval for the true proportion of applicants to Durmstrang that are accepted. Does it appear that Durmstrang accepts 20% of their applicants?
A recent poll of 450 college-age students found that 270 agreed with U.S. foreign policy toward Israel. What is the corresponding 80% confidence interval? ( don't hand writing solution)
A newspaper article reported that 400 people in one state were surveyed and 70% were opposed to a recent court decision. The same article reported that a similar survey of 500 people in another state indicated opposition by only 40%. Construct a 95% confidence interval of the difference in population proportions based on the data.
Please help with A and B
The president’s policy on domestic affairs received a 45% approval rating in a recent poll. The margin of error was given as 0.035. What sample size was used for this poll if we assume a 95% confidence level?
a critic points out that this 95 % confidence interval is only accurate if the statistic follows a normal distrubution , or if the normal model is a good approximation. is this true for this data? explain
ESPN believed that 30 percent of Sportszone visitors were females. To test this hypothesis, it collected audience profile data at the ESPN SportsZone Web site and found that 36% of the visitors were females. Assume that this sample value was based on a sample of 300 users. Test its hypothesis using 95% confidence level.
Adults are spending more and more time on the Internet, and the number experiencing computer-based or Internet-based crime is rising. A 2018 Gallup Poll of 1019 adults, aged 18 and older, found that 723 of those in the sample said that they worry about having their personal, credit card, or financial information stolen by computer hackers. Although the samples in national polls are not SRSs, they are similar enough that our method gives approximately correct confidence intervals. Explain in words what the parameter p is in this setting ? Use the poll results to give a 95% confidence interval for p.
9.
The dataset "nurses" is a random sample of 1,000 cases from “Health Care Provider Credential Data” from Washington State Open Data Portal. In the sample, there are 418 CNA's and 278 of the CNA's have expired credentials. Use the statistics from the nurses dataset to answer the following question: "With 90% confidence, what percent of all CNA's on Washington State's healthcare provider list are expired?"
For part i can you describe that sample using the summaries, in part ii describe if the normality is reasonable, and part iii interpret the confidence interval?

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