A work sampling study requires anacceptable error level of 10 percent and z = 2for 95.45 percent confidence. The adequatesample size isif the sampleproportion is thought to be as large as 50percent, but ________ if the sampleproportion is thought to be about 20 percent.Select one:O a. 50; 20O b. 100; 16O c. cannot be determined from theinformation givenO d. 20; 50O e. 100; 64

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Answered: A work sampling study requires an…

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 company decides to investigate the amount of sick leave taken by its employees. A sample of seven employees yields the following numbers of days of sick leave taken in the past year. 1 1 3 0 0 63 Use this information to answer parts a through c. a. Find and interpret the range. The range is 6 days. Choose the correct interpretation of the range below. A. The largest difference between the mean and any other value is equal to the range. B. The number of days separating the fewest and most sick days taken is equal to the range. C. The range represents the average distance of an observation from the mean. D. The range gives the most useful value for measuring the spread of the data.
A researcher wants to determine the sensitivity of mammograms to determine how effective they are at diagnosing women who have breast cancer. Assume the researcher obtained the above results from a study, calculate and interpret the sensitivity of mammograms for detecting breast cancer. Frequency of Breast Cancer Cases Frequency of Non-Cancer Cases Frequency of Individuals Who Screened Positive 17 5 Frequency of Individuals Who Screened Negative 8 77 Group of answer choices: a. A total of 66.67% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. b. A total of 68% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. c. A total of 70.59% of individuals who have breast cancer test positive for breast cancer when using a mammogram as the primary diagnostic test for breast cancer. d. A total of…
Examine the data and identify anything appearing to be unique. Select all that apply. A. The data are presented as quantitative but are actually categorical. B. The unusually large value of 80 minutes appears to be an error in recording the data. C. Most of the data values are rounded to the nearest 5 or 10 minutes, and may be estimates of actual commute times. D. Based on the gaps in the distribution, the data appear to be from two different populations.
Bill Alther is a zoologist who studies Anna's hummingbird (Calypte anna). (Reference: Hummingbirds, K. Long, W. Alther.) Suppose that in a remote part of the Grand Canyon, a random sample of six of these birds was caught, weighed, and released. The weights (in grams) were as follows. 3.7 2.9 3.8 4.2 4.8 3.1 The sample mean is = 3.75 grams. Let x be a random variable representing weights of hummingbirds in this part of the Grand Canyon. We assume that x has a normal distribution and σ = 0.64 gram. Suppose it is known that for the population of all Anna's hummingbirds, the mean weight is μ = 4.30 grams. Do the data indicate that the mean weight of these birds in this part of the Grand Canyon is less than 4.30 grams? Use ? = 0.10. (a) What is the level of significance? (Enter a number.) State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? H0: μ = 4.3 g; H1: μ > 4.3 g; right-tailed H0: μ < 4.3 g; H1: μ = 4.3 g; left-tailed…
The Law of Large Numbers states that as the number of observations in a sample increases, the mean of this is sample becomes a. exactly equal to the mean. b. closer and closer to the population mean. c. close to 0. d. further and further from the population mean.
In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer.The artifact frequency for an excavation of a kiva in Bandelier National Monument gave the following information. Stratum Flaked Stone Tools Nonflaked Stone Tools 1 10 2 2 10 3 3 9 2 4 1 3 5 4 7 6 38 32 7 51 30 8 25 12 What is the value of the sample test statistic? (Round your answer to three decimal places.)
Use the results from a survey of a simple random sample of 1001 adults. Among the 1001 respondents, 67% rated 13 themselves as above average drivers. We want to test the claim that of adults rate themselves as above average drivers. Complete parts (a) through (c). 20 a. Identify the actual number of respondents who rated themselves as above average drivers. (Round to the nearest whole number as needed.)
Assume that a sample is used to estimate a population proportion p. Find the margin of errors E that corresponds to the given statistics and confidence level: 90% confidence; n=300; x=50
A researcher is testing Xanax and uses a focus group where individuals are assigned to one of two groups and different doses of Xanax. He then gets the participants to learn a list of 20 numbers and three days later sees how many they can recall. In the experiment the dependent measure is simply the number of numbers recalled by each participant. What type of variable is this? a. Nominal b. Ratio c. Interval d. Ordinal

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