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A marketing research firm wishes to estimate the proportion of adults who are planning to buy a new car in the next 6 months. A simple random sample of 100 adults led to 22 who were planning to buy a new car in the next 6 months.
a. Compute the 95% confidence interval for the proportion of adults who are planning to buy a new car in the next 6 months.
b. Interpret this confidence interval.
c. How large a sample size will need to be selected if we wish to have a 95% confidence interval that is accurate to within 1%.
Write Cumulative distribution function.Find the cumulative distribution function F(x).
In a certain city, there are 100,000 persons age 18 to 24. A simple random sample of 500 such persons is drawn, of whom 198 turn out to be currently enrolled in college.
When performing a chi-square test for independence, explain how the "cell frequencies under the independence assumption" are calculated.
Determine the calculated value of the test statistic? What distribution does test statistic have when null hypothesis is true?
The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting, Inc. during the first quarter of 2004.
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula.
You are running a chi-squared test. If you have 5 groups with 3 characteristics each, what would your critical value be with an alpha of .25? a . Between 0 and 3.0
Calculate a standard error for the sample mean production rate for the new method and what is the standard error of the $1600 estimate?
Ninety of the sample students are in the Business College, 120 are in the Liberal Arts College, and 90 are in the Education College.
A researcher hypothesizes that parents with school-aged children are more probable to vote in favour of a referendum increasing public school spending than adults without school-aged children, but wonders of this relationship holds for both Democr..
If sensitivity and specificity remain constant, determine the relationship of prevalence to predictive value positive and predictive value negative?
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