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Calculating the p chart limits for school absenteeism. Here are data from an urban school district on the number of eighth-grade students with three or more unexcused absences from school during each month of a school year. Because the total number of eighth-graders changes a bit from month to month, these totals are also given for each month.
(a) Find p. Because the number of students varies from month to month, also find n, the average per month.
(b) Make a p chart using control limits based on n students each month. Comment on control.
(c) The exact control limits are different each month because the number of students n is different each month. This situation is common in using p charts. What are the exact limits for October and June, the months with the largest and smallest n? Add these limits to your p chart, using short lines spanning a single month. Do exact limits affect your conclusions?
A brand name has a 60% recognition rate. Assume the owner of the brand wants to verify that rate by beginning with a small sample of 6 randomly selected consumers.
1. Determine whether a linear regression model is appropriate. 2. Calculate b1 and b0. What is the sample regression equation? 3. Find the predicted value of y if x is 10, 15, and 20.
If the sum of the squared deviations about the regression line is SSE = 40.0, what is the coefficient of determination?
as an epidemiologist you are going to investigate the effect of a drug suspected of causing malformations in newborn
Odds of drawing a black card. If you deal one card from a standard deck, the probability that the card is a black card is 0.50. Find the odds of drawing a black card.
the half width of a 99 confidence interval for a mean based on sample size of 30 is 10. what is the value of the sample
a new muscle relaxant is available. researchers from the firm developing the relaxant have done studies that indicate
Are the residuals from such a regression independent? Is there a difference in model fit and independence of residuals when using infant death rate as a response variable?
1.The demand for Carolina Industries product varies greatly from month to month. Based on the past two years of data, the following probability distribution shows the company's monthly demand:
Tthen calculate the 95% and 99% CIs for the proportion of all female Hispanic drivers in Boston who wear seatbelts. Why is the 99% CI wider than the 95% CI?
Suppose you want to conduct a survey of the attitude of psychology graduate students studying clinical psychology toward psychoanalytic methods of psychotherapy.
The snow tire company wants to advertise 10% of their snow tires last longer than 45,000 miles. If the standard deviation remains at 2500 miles, what must the mean life-span of the tread be improved to? Show work.
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