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The time for a professor to grade an exam is normally distributed with a mean of 12.6 minutes and a standard deviation of 2.2 minutes. The interval around the mean that contains 95% of the times nee
The time for a professor to grade an exam is normally distributed with a mean of 12.6 minutes and a standard deviation of 2.2 minutes. The interval around the mean that contains 95% of the times ne
A production process produces items, of which 6% are defective. A random sample of 160 items is selected every day and the number of defective items, say X, is counted. Using the normal approximatio
Catherine Chao, Director of Marketing Research, is evaluating consumer acceptance of a new toothpaste package. She plans to use a 80% confidence interval estimate of the proportion of households whi
In relation to the quality of data entry options, i.e. databases (such as EpiInfo, ACCESS) and spreadsheets (such as Excel), which of the following statements is true?
Having never smoked more than five cigarettes previously and having smoked five or less cigarettes previously are __________ events.
Construct a stem-and-leaf plot for these data. Construct an ordered stem-and-leaf plot. Use this plot to find the 60th and 90th percentiles.
Having consumed 3 standard drinks (in terms of alcohol) per night for five nights in the last 30 days given any alcohol was consumed in the last 30 days is a __________.
Calculate the sample mean, sample variance, and sample standard deviation. What are the units of measurement for each statistic?
A study will be conducted to estimate the population proportion. A level of confidence of 99% will be used and an error of no more than .04 is desired. There is no knowledge as to what the populatio
Suppose that when the defendant is, in fact, guilty, each judge will independently vote guilty with probability 0.7, whereas when the defendant is, in fact, innocent, this probability drops to 0.2.
A "word" is a sequence of 8 bits. Each bit is either "on" or "off at any given time. Twenty 8-bit words are stored, and a power surge is induced. let x denote the number of bit reversals that result
Given the student waited less than 45 minutes, what is the probability they waited less than 20 minutes? What is the standard deviation of waiting time?
Apply the test of significance approach at 5% level for b1 and b2. Test the null hypotheses for b1 and b2 through the confidence interval approach at the 95%
Consider the following table for a single-factor ANOVA. Level of Factor Replicates 1 2 3 1 2 2 7 2 2 2 7 3 0 4 5 (a) Find x1,2. (b) Find x2,1. (c) Find C1. (d) Find x. (e) Find (Ci )2.
When doing an experiment with many groups, what is the problem with doing t tests between all possible groups without any correction? Why does use of the analysis of variance avoid that problem?
If it can be assumed that the diameters are distributed as N(mu, (0.0015)^2 for a wide range of values of mu. What is the power of the test at mu = 0.2490?
Let the probability density function PDF of a random variable X takes the form c(3x^2+2x) for 0<=x<=2 and 0 otherwise.
A researcher wants to construct a 99% confidence interval for the proportions of people who changed jobs in the past year. What sample size is needed so that the confidence interval will have a mar
A pollster wants to construct a 95% confidence interval for the proportion of adults who believe that the economic conditions are getting better. A Gallup poll taken in July 2010 estimates this pro
A utility company sampled 451 customers, and finds that 103 of them had a discrepancy on their service bill. What is the upper bound for the 99% confidence interval for the proportion of customers
In the computer game World of Warcraft, some of the strikes are critical strikes, which do more damage. Assume that the probability of a critical strike is the same for every attack, and that attack
Find the upper bound of the 99% confidence interval for the mean rate. Round to three decimal places.
A manufacturer ships toasters in cartons of 10. In each carton, they estimate a 30% chance that one of the toasters will need to be sent back for minor repairs. What is the probability that in a car
Choose all the subjects to be close together in initial cholesterol level, engage in the same level of exercise, have approximately the same BMI (body mass index - a standardized measure of weight)