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A market research company interviews a simple random sample of 3,600 persons in a certain town, and asks what they did with their leisure time last year: 39.8% of the respondents read at least one book, whereas 39.3% of them entertained friends or relatives at home. A reporter wants to know whether the difference between the two percentages is statistically significant. Does the question make sense? Can you answer it with the info given?
an insurance company is reviewing its current policy rates. when originally setting the rates they believed that the
A) Describe the term population. B) Describe the term random sample. C) What is the difference between a population and a random sample?
A social scientist believes that university theology professors are more conservative in political orientation than their colleagues in psychology
Add titles and modify the default colors, fonts, etc., as you judge appropriate to make the scatter plot effective. (b) Describe the relationship (if any) between X and Y. Weak? Strong? Negative? Positive? Linear? Nonlinear?
At.05 level of significance, is there sufficient evidence to conclude that difference exists between proportion of cats and proportion of dogs which sleep more than 10 hours per day?
a beer distributer believes that the amount of beer in a 12 ounce can of beer has a normal distribution with a mean of
Determines the sample mean outer diameter to be 1.002 inches with a standard deviation of 0.003 inch. Calculate the process capability index for this example.
A researcher is studying IQ levels. From past experience she knows the population mean IQ for adults is 110 and the standard deviation is 15.
Advertising coefficient is 200 and t stat is 1.75. Which of the following statements is an accurate interpretation of the situation when using an alpha of .10
the number of robberies in each precinct in 2009 is what level of measurement?1. none2. nominal3. ratio4.
a newspaper conducted a statewide survey concerning the 1998 race for state senator. the newspaper took a srs of n1200
What is the probability of at least three hacker attempts during a month? What is the probability of a hacker attempt occurring every 15 days or less (assume a 30 day month).
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