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Q1) By measuring amount of time it takes component of the product to move from one workstation to next, an engineer has evaluated that standard deviation is 3.5 seconds.
(A) How many measurements must be made in order to be 99% certain that maximum error of estimation won't exceed 1 second?
(B) What sample size is needed for a maximum error of 2 seconds?
Q2) In 1992, FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, and determined that 1,143 were positive.
(a) Create a 95% confidence interval for population proportion of positive drug tests.
(b) Why is normality assumption not problem, despite the very small value of p?
Each egg was also measured for volume using a water displacement method. We wanted to know if the two methods agreed or not
Why is it misleading to draw the conclusion from the test above that long-time exposure to cadmium reduces the vital capacity?
Then use ogive to estimate median and first and third quartiles. Also utilize it to reply following question: What percent of 60 mutual fund loads are less than 75.
A statistics instructor wants to know which route will get her to school the fastest. Each day from October 2 to November 15, when she gets to the turn point she checks the odometer on her car
The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
Determine the probability of choosing the area code at random which ends in the odd number if first digit cannot be 1 or 0?
Develop a linear regression equation for the given data and forecast how much money Robert will win if he spends $30.
Using the following data on 15 workers, construct an exact 95% confidence interval for µ.
How closely is the height of an individual related to the weight? Partial regression output for a sample of 92 individuals is below.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots.
Using the confidence interval when conducting a two-tail test for the population mean we do not reject the null hypothesis if the hypothesized value for:
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