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Hiring. In preparing a report on the economy, we need to estimate the percentage of businesses that plan to hire additional employees in the next 60 days.
a) How many randomly selected employers must we contact in order to create an estimate in which we are 98% confident with a margin of error of 5%?
b) Suppose we want to reduce the margin of error to 3%. What sample size will suffice?
c) Why might it not be worth the effort to try to get an interval with a margin of error of only 1%?
a. Select the variable Sales. Develop a frequency distribution and histogram for Sales. b. Compute the mean, median, and standard deviation for the Sales variable. c. Determine the interquartile range for the Sales variable.
Does the article discuss the W s for the data?- What are the units of the variable?- Is the average used the median or the mean? How can you tell?
in exercises 9.55-9.60 we have given the value obtained for the test statistic z in one mean z-test. we have also
a study reported in the journal of small business management concluded that self employed individuals do not experience
An environmental service reported that a sample of 15 wild horses had a mean weight of 915 pounds with a sample standard deviation of 58 pounds. Calculate the margin of error, E, for a 99% confidence interval for the population mean weight µ of al..
Construct a first- order autoregressive forecasting equation for these data, calculate the mean absolute deviation (MAD) for the fit of the forecast values to the actual values, then use the equa- tion to forecast the PPI for 2008. Source: Bureau o..
assume that a sample is used to estimate a population proportion p. find the margin of error e that corresponds to the
Ben asserts that the result should be obtained using the sequential rule for define: b is defined to be 11, then a is defined to be 5, so the result is 16. Alyssa objects that mutual recursion requires the simultaneous scope rule for internal proc..
This project applies linear regression models to the estimation of automobile prices. The dependent variable is the automobile prices. The independent variables are the variables to explain the price.
Prove that every complete, irreflexive, and transitive relation is asymmetric: if- Prove that the Gale-Shapley algorithm for finding a stable matching satisfies the given property.
A test of the null hypothesis H0 : µ = µ0 gives a test statistic z = -2.21. (a) What is the p-value if the alternative is HA : µ > µ0? (b) What is the p-value if the alternative is HA :µ
The automatic control of an airplane is one example that requires multiple-variable feedback methods. In this system, the attitude of an aircraft is controlled by three sets of surfaces:
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