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Question: A service agency wishes to assess its clients' views on quality of service over the past year. Computer records identify 1000 clients over the past 12 months, and a decision is made to select 100 clients to survey.
(a) Describe a procedure for selecting a simple random sample of 100 clients from last year's population of 1000 clients.
(b) The population of 1000 clients consists of 800 Caucasian-Americans, 150 African-Americans and 50 Hispanic-Americans. Describe an alternative procedure for selecting a representative random sample of size 100 from the population of 1000 clients.
(c) Give the R commands for implementing the sampling procedures described in parts (a) and (b).
Go to the Statistics: Concepts and Controversies Web site, www .whfreeman.com/scc7e, and look at the Correlation and Regression applet.
Determine a 95% con?dence interval on μ, the true population mean number of sick days taken per employee. Does the evidence in the data support the hypothesis that the mean number of sick days taken by employees is less than 14.00 days?
Find the probability of guessing (a) exactly three answers correctly, (b) at least three answers correctly, and (c) less than three answers correctly.
If the population standard deviation is $7, and a random sample of 50 properties is chosen, what is the probability that the sample average will be below $35?
CASE STUDY: Are the Fish Safe to Eat? Assessing which Factors affect Mercury Levels in Fish in Maine Lakes.
What the mean means The figure below is a density curve. Trace the curve onto your paper. Mark the approximate location of the median.
1. With regards to a standard normal distribution complete the following: (a) Find P(z
Determine a and b so that there is a probability of about 0.68 of seeing between a and b heads.
Utilize a test of the difference among proportions when answering these questions. Illustrate the research hypothesis.
What is a hit ratio? Will a hit ratio of 67% be sufficient when one group has 100 observations, another group has 200 observations.
About 20% of the male population smokes. If you learn that a male has lung cancer, what are the odds that he is a smoker?
Suppose that the researcher finds a moderately strong positive correlation. Describe three different possible cause-and-effect explanations for this relationship.
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