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What's wrong? Explain what is wrong with each of the following:
(a) The margin of error for a confidence interval used for an opinion poll takes into account the fact that people who did not answer the poll questions may have had different responses from those who did answer the questions.
(b) If the P-value for a significance test is 0.35, we can conclude that the null hypothesis has a 35% chance of being true.
(c) A student project used a confidence interval to describe the results in a final report. The confidence level was 110%.
A random sample of 1000 daily newspapers found that on average, each edition contained 3.01 local crime stories per day, with a standard deviation of 2.65. Answer the following questions assuming that the distribution of crime stories in newspaper..
a statistical tutorial centre has been designed to handle a maximum of 25 students per day. suppose that the number x
Within each of your current careers/ jobs, there are sets of data that can be analyzed. For example, a teacher can use a set of test scores, a dietician can analyze a set of patient weights and correlate them to incidences of diabetes, and a sales..
The engineer collects a random sample of items and ?nds that 5 out of the 16 items in the sample are defective. Find the engineer's posterior probability distribution of the proportion of defective items.
For the previous exercise, compute a 0.95 confidence interval and compare the result with your decision about whether to reject H0.
In a random sample of 512 parents with young children, 275 admitted to spanking their child as a regular form of punishment. Use the classical approach, at a 10% level of significance, to test the sociologist's claim.
Scores by women on the SAT-I test are normally distributed with a mean of 998 and a standard deviation of 202. Scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6.
a survey is taken in which 40 randomly selected respondents aged 25-40 are asked how many biological children they
Construct a rough sketch of the least squares prediction equation. Describe the nature of the curvature in the estimated model.
Consider a branching process with a Po(m)-distributed offspring. Let X(1) and X(2) be the number of individuals in generations 1 and 2, respectively. Determine the generating function of
The tab labeled 17.40 contains sealant strength measurements on 25 days of production for Boston shingles and 19 days for Vermont shingles. For the 25 days of production for Boston shingles, construct a control chart for the range and construct a c..
For each of the following tests concerning the autocorrelation parameter ρ in regression model (12.2) with three predictor variables. state the appropriate decision rule based on the
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