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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?
To find the necessary sample size to achieve the given level of accuracy of prediction.
Is the hot-air balloon significantly shorter than light rail? How can you tell? What do you tell university officials?
The distribution of lifetimes for a certain type of light bulb is normally distributed with a mean of 1000 hours and a standard deviation of 100 hours. Find the 33rd percentile of the distribution of lifetimes.
In comparing two variances below, determine test value and what are degrees of freedom that must be used?
A shock can cause the failure of component 1 alone with probability p, component 2 alone with probability q, both components with probability r, or have no effects with probability 1-p-q-r. Suppose no repairs are possible and the system fails when..
The National Survey of Student Engagement (NSSE) surveys freshmen and seniors about their level of engagement in campus and classroom activities that enhance learning.
What is the OR of getting cancer fora late child birth woman compared to an early first birth woman?
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Assume a population standard deviation of 450-kilowatt hours. Determine the standard error of the mean.
The heights in centimeters of 5 students are: 165, 175, 176, 159, 170. The sample median and sample mean are respectively:
At the .05 significance level, can we conclude that the guideline is still reasonable?
Public transportation and the automobile are 2 methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
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