Let p₁ be the proportion of students in English class who receive grade A, and p2 be the proportion ofstudents in Math class who receive grade A.A 90% confidence interval for p-p2 is given as (-0.2, 0.05). With 90 % confidence...[select one statement which correctly finishes the sentence]On average, a higher percent of students in English class receive Grade A than the percent of studentreceive grade A in Math class.On average, a lower percent of students in English class receive Grade A than percent of studentsreceive grade A in Math class.On average, students in English class score 0.25 points higher than students in Math class.O The data does not suggest that students in English class has a different percent of students receivinggrade A in Math class. The percent who receive grade A in both English and math class may be thesame.

Given,the sample proportions of Grade A in English class and Maths class.To choose the correct…

Answered: Let p₁ be the proportion of students in…

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 95% confidence interval for the mean reading achievement score for a population of third grade students is (44.2, 54.2). Suppose you compute a 99% confidence interval using the same information. Which of the following statements is correct? A. The intervals have the same width. B. The 99% interval is longer. C. The 99% interval is shorter. D. None of the above.
A survey asked, "How many tattoos do you currently have on your body?" Of the 1227 males surveyed, 181 responded that they had at least one tattoo. Of the 1003 females surveyed, 137 responded that they had at least one tattoo. Construct a 95 % confidence interval to judge whether the proportion of males that have at least one tattoo differs significantly from the proportion of females that have at least one tattoo. Interpret the interval. Let p 1 represent the proportion of males with tattoos and p 2 represent the proportion of females with tattoos. Find the 95 % confidence interval for p 1 minus p 2 . The lower bound is . The upper bound is .
Suppose that 18% of a random sample of 2307 Miami residents said that they will donate blood in 2021. Use a 90% Confidence Level to find a Confidence Interval for the proportion of all Miami residents who will donate blood in 2021? The decimals in your answer must be rounded to three decimal places. O A. (0.167, 0.193) O B. (0.186, 0.201) O C. (0.164, 0.196) O D. (0.192, 0.211)
Suppose that a random sample of 50 bottles of a particular brand of cough syrup is selected and the alcohol content of each bottle is determined. Let μ denote the average alcohol content for the population of all bottles of the brand under study. Suppose that the resulting 95% confidence interval is (7.8,9.4). a. Would a 90% confidence interval calculated from this same sample have been narrower or wider than the given interval? Explain your reasoning. b. Consider the following statement: There is a 95% chance that µ is between 8 and 9.4. Is this statement correct? Why or why not? c. Consider the following statement: We can be highly confident that 95% of all bottles of this type of cough syrup have an alcohol content that is between 7.8and 9.4. Is this statement correct? Why or why not? d. Consider the following statement: If the process of selecting a sample of size SO and then computing the corresponding 95% interval is repeated 100 times,95 of the resulting interval will includeµ.…
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)
What is the lower endpoint of a 95% confidence interval for the percent of students who like online classes if for a sample of 134 students 92 students liked online classes? C e M AD ►
A research study reported a 95% confidence interval for the mean time of hip surgeries based on a sample of 91 patients as (116 minutes, 138 minutes). Which of the following statements is correct about the given interval? A. Correct B. Incorrect - We are 100% sure that the mean time of hip surgeries of the sampled 91 patients is between 116 and 138 minutes. -95% of the hip surgeries of the sampled 91 patients will fall between 116 and 138 minutes. We are 100% sure of hip surgeries take between 116 and 138 minutes. We are 95% sure that hip surgeries will take, on average, 116 to 138 minutes.
A new drug to treat high cholesterol is being tested by pharmaceutical company. The cholesterol levels for 27 patients were recorded before administering the drug and after. The 99% confidence interval for the true mean difference in total cholesterol levels (after - before) was (-78.82, -31.18). Which of the following is the appropriate conclusion? Question 4 options: 1) We are 99% confident that the average difference in cholesterol levels is positive, with the higher cholesterol levels being before the drug regimen. 2) We are 99% confident that the average difference in cholesterol levels is positive, with the higher cholesterol levels being after the drug regimen. 3) We are 99% confident that the average difference in cholesterol levels is negative, with the higher cholesterol levels being before the drug regimen. 4) We are 99% confident that the average difference in…
Likely voters were surveyed to determine if they would vote for their party's candidate. The voters were divided into 2 groups Republicans (group 1) and Democrats (group 2). A 95% confidence interval for pl-p2 was found to be as follows: (-015, .035) Interpret the endpoints of this interval in the context of this problem. Do not use the word "difference" in your answer.
A survey asked, "How many tattoos do you currently have on your body?" Of the 1203 males surveyed, 184 responded that they had at least one tattoo. Of the 1067 females surveyed, 133 responded that they had at least one tattoo. Construct a 99% confidence interval to judge whether the prope one tattoo differs significantly from the proportion of females that have at least one tattoo. Interpret the interval. Let p, represent the proportion of males with tattoos and p, represent the proportion of females with tattoos. Find the 99% confidence interval for p, - P2- The lower bound is The upper bound is (Round to three decimal places as needed.)
The Athletics Department at a high school is interested in the difference in the run times between 11th and 12th grade students. Suppose the 11th grade students make up the first sample while the 12th grade students make up the second.Using a confidence level of 95%, the confidence interval found was (−1.8,2.9)(-1.8,2.9).Which of the following is the correct interpretation? We are 95% confident that the run times of the 11th grade students are, on average, faster than those of the 12th grade students. We are 95% confident that the run times of the 11th grade students are, on average, slower than those of the 12th grade students. We are 95% confident that the run times of the 11th grade students are, on average, about the same as those of the 12th grade students.
A survey asked, "How many tattoos do you currently have on your body?" Of the 1217 males surveyed, 183 responded that they had at least one tattoo. Of the 1098 females surveyed, 146 responded that they had at least one tattoo. Construct a 99% confidence interval to judge whether the proportion of males that have at least one tattoo differs significantly from the proportion of females that have at least one tattoo. Interpret the interval. Let p, represent the proportion of males with tattoos and p, represent the proportion of females with tattoos. Find the 99% confidence interval for p, - p2. The lower bound is The upper bound is (Round to three decimal places as needed.) Interpret the interval. O A. There is 99% confidence that the difference of the proportions is in the interval. Conclude that there is insufficient evidence of a significant difference in the proportion of males and females that have at least e tattoo. B. There is a 99% probability that the difference of the…

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