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You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion. A pilot survey reveals that 5 of the 50 sampled hold two or more jobs.
How many in the workforce should be interviewed to meet your requirements?
This problem involves calculating and interpreting the 95% confidence interval for a proportion. While you can use SPSS to determine proportions, you need to calculate the confidence interval by hand.
State the null and the alternative hypotheses. Using the p-value approach, test to determine whether or not the mean age of all employees is significantly more than 40 years.
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
Basic Statistics problem
What is the relationship between descriptive statistics and Affirmative Action ? Can using probability in market trending decisions lead to a bad decision? Explain?
Carry out a t-test to see if the mean healing rate is significantly lower in the experimental limbs, including all 12 newts. What are the test statistics and their P-values?
The average number of television sets in the sample households turns out to be 1.86, and the SD is 0.86. Find a 95% confidence interval for the average number of television sets per household.
A company sampled 40 of the springs that it manufactures for use in small engines and discovered that 20% of the springs did not meet specifications.
Given that x is a normal variable with mean u = 47 and standard deviation = 6.2, find:
Consider the following continuously operation job shop. Inter arrival times of jobs are described as follows: What is the average time for the 10 new jobs?
Order pizza with this new crust again. Calculate a 98% confidence interval for the proportion of customers who would order the new thin crust pizza again.
Suppose a small bicycle manufacturer makes cheap bikes that sell for 180$ each. The total cost of producing x bikes (in $) is given by c(x)=6000+240x-0.8x^2, where x is up to 200 bikes.
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