A study of 40 English composition professors showed that they spent, on average, 12.6 minutes correcting a student’s term paper. a) Find the 90% confidence interval of the mean time for all composition papers when σ = 2.5 minutes. b) If a professor stated that he spent, on average, 30 minutes correcting a term paper, what would be your comment?

Q: Suppose a 95% confidence interval for a population proportion is found using the theory-based…

A: given data  95% ci for p  using theory based method. what it contains defenately from given options?…

Q: Suppose​ that​ 18% of a random sample of 2307 Miami residents said that they will donate blood in…

A: we have given that sample size =n=2307 ,sample proportion =p^=18%=0.18

Q: A trade magazine routinely checks the drive-through service times of fast-food restaurants. An 80%…

A: We have given that a trade magazine routinely checks the drive-through service times of fast-food…

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Q: mpling process is repeated many time sers who use this social media platfor

A: Option b) is correct.   The estimate is given by p^ =0.458 + 0.5282 = 0.52

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A: Given that, A mathematics teacher recently graded a chapter test for students in his abstract…

Q: Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample…

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Q: A Pew Internet Project Data Memo presented data comparing adult gamers with teen gamers with respect…

A: There are two independent samples which are adult gamers and teen gamers. We have to construct 95%…

Q: C. Find the length of the confidence interval given the following data: 1.s = 4.5, n = 20,…

A: Here use formula of length of confidence interval

Q: If n=380 and X = 304, construct a 90% confidence interval. Give your answers to three decimals…

A: Given,n=380 ,x=304p^=xnp^=304380=0.81-p^=1-0.8=0.2α=1-0.90=0.1α2=0.05Z0.05=1.645     (from Z-table)

Q: Example: Compute the 90%, 95%, and 99% confidence intervals for the population mean credit card…

A: The summary statistics for the population mean credit card balances is provided as; The confidence…

Q: In terms of z scores, a 95% confidence interval consists of which of the following ranges? 1. ±1 z

A: Given, Z=x-μσ where, x= observed value μ=mean of the sample σ=standard deviation

Q: Please answer all. Thank you. A 95 percent confidence interval for the mean can be interpreted mean…

A: We have give that the statement 95% confidence interval for the mean can be interpreted

Q: A history teacher records the SAT scores of all 87 of her students. The data is used to construct a…

A: For calculating the confidence interval, we need to satisfy the following conditions: Independence…

Q: An employee of the College Board analyzed the mathematics section of the SAT for 93 students and…

A: The correct alternative is, we will never know whether (28.255, 33.945) covers the true mean.

Q: Use the following to answer the next two questions. A 2020 poll found that 520 out of 824 randomly…

A:

Q: own residents were interviewed and it was found that 422 responded favorably to a question while 501…

A: given data, 422-favorably responded501-negetively responded 923- total  interviewed for positive…

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Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: #4. A college president commissioned a study to find the proportion of students enrolled at her…

A:

Q: Find the confidence level if the n = 32 and xřight = 50.89. %3D

A: Given information- Sample size n = 32 We have given the value χright2=50.89 We have to find the…

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A:

Q: You are watching a nightly news broadcast on CNN and the reporter says that a 90% confidence…

A: We have to determine which statement is correct for given situation.

Q: Look at the confidence intervals described in the four options below.  Then, imagine that for each…

A: Solution-: Look at the confidence intervals described in the four options below.  Then, imagine that…

Q: Example 11.7 A firm manufacturing steel furniture desires to estimate the proportion of the…

A:

Q: Question Z A random sample of 170 people were asked if they traveled more than 2000miles on their…

A: a) i. Sample is random II) No. of successes (respondents) is it and number of failures is (170 - 17)…

Q: 1. Online News In a Harris poll of 2036 adults, 40% said that they prefer to get their news online.…

A: Given that the sample size is n=2036 and sample proportion, p^=0.40. Confidence level=95%…

Q: Which of the following would result in the narrower confidence interval?

A: Note: The confidence interval with small confidence level has the narrower confidence interval. The…

Q: Question 85 parts D and E

A: Solution: 85. d. State the hypotheses. Null hypothesis: That is, the proportion of students study…

Q: this is part 2 of a question. Although older Americans are most afraid of crime, it is young people…

A: Given information:Confidence level =0.90Sample size (n) = 66Favorable outcome (r) = 11Significance…

Q: Question 4: A website is trying to improve registration for first-time visitors by showing 1% of the…

A: Let p be the population proportion of first-time visitors who saw the new design that registered.…

Q: I was wondering how to find the confidence interval for this data. And how can I get this answer…

A: X Y (x-xbar)^2 (y-ybar)^2 17 24 43.34028 53.77778 26 7 5.840278 93.44444 31 15 55.00694…

Q: registered. Construct a 90% confidence interval for the proportion of first-time visitors who saw…

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Q: d) Find the p-value and compare to the significance level (5%) e) State the formal conclusion and…

A: From the information, given thatThe claim is to test whether the population proportion of U.S.…

Q: A random sample of high school students

A: Here it is given that, A 99% confidence interval based on this sample is 1.7 hours to 3.1 hours

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A:

Q: Question 83 Parts A and B

A: Solution: It is required to fill in the blanks for the given questions. (a) The hypotheses are…

Q: Use the data attached: 1. In two to three sentences, explain what a confidence interval means(in…

A:

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.