In a random sample of 500 people eating lunch at a cafeteria on various Fridays, it was found that 160 preferred seafood. A90% confidence interval for the actual proportion of people eating seafood on Fridays (rounded off to two decimals) is:O A. [0.29; 0.35]O B. [0.27; 0.37]O C. [0.28; 0.34]O D. [0.28; 0.36]

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Answered: In a random sample of 500 people eating…

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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In terms of z-scores, a 95% confidence interval consists of which of the following ranges? A. μ ± 1.96(z) B. μ ± 2.05(z) C. μ ± 1(z) D. μ ± 2.58(z)
Which of the following statements regarding Z scores is FALSE? a. It indicates whether the raw score is above or below average. b. It indicates whether or not a distribution is skewed. c. It indicates the percentage of cases between that score and the mean d. It is sometimes referred to as a standard score
2. Which of the following statements defines the 97.5th percentile value for a data sample, regardless of the sample data distribution? The value that is 97.5% larger than the sample mean. The value such that 2.5% of the sample observations are larger than this value, and 97.5% of the sample observations are smaller than this value. The value such that 97.5% of the sample observations are larger than this value, and 2.5% of the sample observations are smaller than this value. This value always corresponds to the sample mean plus 2 standard deviations.
11. Add 6 to each number in the dataset. Then, the 15th percentile is:a. 1b. 6c. 8d. 7Use the following information to answer questions 12-14: Suppose the probability that an adult gets thenews from Facebook is 0.60. A random sample of 14 adults were surveyed to determine X, the numberof adults who get their news from Facebook.12. Which of the following statements is false?a. The set of possible x-values is {1, 2, 3, . . ., 14}b. X ~ B (14, 0.60)c. P(X=5) = 0.0408d. µ = 8.413. Find the probability that at least 6 adults get their news from Facebook.a. 0.8499b. 6/14c. 0.6429d. 0.941714. X is of data of type:a. categorical nominalb. categorical ordinalc. numerical continuousd. numerical discrete15. Suppose that the ages of Brunswick CC students are normally distributed. A random sample of 6Brunswick CC students reported the ages of 20, 35, 18, 45, 27, and 20 years old. Find the errorbound that corresponds to the 90% confidence interval for the true population mean age ofBrunswick CC…
Tina catches a 14-pound bass. She does not know the population mean or standard deviation. So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds. Find the t and calculate a 95% (α = .05) confidence interval.
If [0.64, 0.82] is a confidence interval for the population proportion. Find the value of the point estimator of the population proportion. Select one: O a. 0.73 O b. 0.70 O c. 0.74 O d. 0.72
The results: A. Are, or B. Are not significantly: A. High, or B. Low so there: A. is, or B. is not
A professor was curious about her students' grade point averages. She took a random sample of 15 students and found a mean GPA of 3.01 with a standard deviation of 0.534. Which of the following formulas gives a 99% confidence interval for the mean GPA of the professor's students?
For the following data 5,6,8,9 o = 2.1 Then C.V.= Select one: O a. 21.1% O b. 33.3% O c. 38% O d. 30%
Use the following sample information below to calculate the confidence interval to estimate the population proportion. Let x be the number of items in the sample having the characteristic of interest. a. n = 116 and x = 57, with 99% confidence b. n = 800 and x = 479, with 97% confidence c. n = 240 and x = 106, with 85% confidence d. n = 60 and x = 21, with 90% confidence
Use the results from a survey of a simple random sample of 1064 adults. Among the 1064 respondents, 69% rated 13 themselves as above average drivers. We want to test the claim that more than 20 of adults rate themselves as above average drivers. Complete parts (a) through (e). A. No. Assuming quality of driving can be quantified, half of all adults must have driving quality less than or equal to the mean. B. Yes. Assuming quality of driving can be quantified, a distribution that is extremely skewed to the right would be the most promising scenario for more than this proportion of adults to have driving quality that is above the mean. C. Yes. Assuming quality of driving can be quantified, a distribution that is extremely skewed to the left would be the most promising scenario for more than this proportion of adults to have driving quality that is above the mean. O D. No. It is impossible to compare the quality of different adults' driving. b. If we use the same significance level to…
Four students are instructed to calculate a confidence interval based on the same sample mean (xbar: 0.76) and the same sample standard deviation s. However, each student is given a different sample size and confidence level. The following are the intervals obtained by the four students. Which of the following must be incorrect? A. (0.09, 1.43) B. (-1.11, 2.89) C. (-0.57, 2.09) D. (-2.22, 3.74)

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