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1. The independent Department Store wants to determine the proportion of their charge accounts having unpaid balance of $500.00 or more. A sample of 250 accounts revealed that 100 of them had unpaid balance of $500 or over. What is the 99% confidence interval for the population proportion?
2. The manager of the A & B Supermarket wants to estimate the mean time a customer spends in the store. A 95% confidence level must be used. The standard deviation of the population based on a pilot survey is estimated to be 3.0 minutes. The manager requires the estimate to be within 1.0 minutes of the population value. What sample size is needed?
LSAT scores are normally distributed, with a mean of 150 and s = 10.
Create a scatter plot for those data. Based on scatter plot, how would you explain relationship between the two variable.
The data below shows the time to process an inpatient admission, before and after a system usage training session was given. The following hypotheses were formulated for this study.
At the .01 significance level, is there a relationship between job pressure and age?
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
Determine the mean number of times the machine was used per day.
Develop a joint probability table for these data. If a student goes full time, determine the probability that school quality is first reason for selecting a school?
Also use the regression model to predict a student's average if he/she misses 4 classes.
A company tracked the number of complaints it received during the first 6 months of last year, as shown in the following table:
Describe the Linear programming problem with constraints. Which among the following is not acceptable as a constraint in a linear programming problem?
In 1965, a newspaper carried a story about a high school student who reported getting 9207 heads and 8743 tails in 17,950 coin tosses. Is this a significant discrepancy from the null hypothesis H 0 = 1/2.
Do the association between the sizes of the heads and bodies of the two species appear to be strong? Explain.
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