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A researcher examines the records of all registered voters in one city and finds that 43% are registered democrats. Is the evaluated group a population or a sample ?
Provide two values. For each pair of values, use a percentage to express their relative change or difference. Use the second given value as the reference value and express results to the nearest per
Analyze these data using parallel boxplots. Conduct the appropriate hypothesis test using 0.01 significance level. Construct a 99% confidence interval for the true difference in the mean time
Conduct the most appropriate hypothesis test using a 0.05 significance level. Discuss your conclusions about the chrome plating process based in this analysis. Construct a 95% confidence interval fo
Yashchin (1995) discusses a process for the chemical etching of silicon wafers used in integrated circuits. This process etches the layer of silicon dioxide until the layer of metal beneath is reac
Kane discusses the concentricity of an engine oil seal groove. Historically, the standard deviation for the concentricity is 0.7. The target average concentricity is 5.6. To monitor this process, he
The mean prepartion fee H&R blocked charged retail customers last year was $183 (The wall street Journal, March 7,2012.) Use this price as the population mean and assume the populations standard
Due to normality, the formula for computing z is the same for a single data value, as it is for an average of the data values for a sample group. true or false?
Characterize the sample space describing the prisoner's possible allocation options. (Intuitively, which allocation affords the prisoner the greatest chance of survival?)
The sample sizes for each are 23. He is adamant that you perform a z-test. What would you tell him? What specific explanation would you give?
Among the 2286 responsants, 1000 said that they only play hockey, what percentage of respondents saidi that they only play hockey. I got 44%. Any help you can give would be appreciated.
In six test runs, a truck operated 8, 10, 15, 7, 9, and 11miles with one gallon of gasoline. At the 95% level of confidence, is this sufficient evidence to show that the truck is operating at a mean
We are studying the proportion of cities that have private garbage collector. We want a maximum error of 0.10 and a 95% confidence level, and tentatively estimate the proportion at 0.50. What is the
A survey reported that 70% of those responding to a national survey of college freshmen were interested in taking summer courses. Using the sample size of 49, calculate a 95% confidence interval for
Suppose that in bags of Christmas M&Ms, half of the M&Ms are supposed to be red, and the other half green. In a bag with 120 M&Ms and using a significance level alpha of 0.05, what is t
The cost of a college education has increased at a much faster rate than costs in general over the past twenty years. In order to compensate for this, many students work part- or full-time in additi
The cost of a college education has increased at a much faster rate than costs in general over the past twenty years. In order to compensate for this, many students work part or full time in additio
A study showed that 36 out of 120 students of USC watched the football game between USC and USF. Which one can be a possible proportion of students who watched the game with 95% level of confidence.
Woof Chow Dog Food Company believes that it has a market share of 25 percent. It surveys n = 100 dog owners and ask whether or not Woof Chow is their regular brand of dog food, and 23 people say yes
The U.S. Post Office is interested in estimating the mean weight of packages shipped using the overnight service. They plan to sample 300 packages. A pilot sample taken last year showed that the sta
A study claims that 85% of bronx high school students experience homework problems. Jessie wants to test this claim, so she randomly samples 60 students and finds that 45 have experienced homework
A normal distribution has a mean of 25 and a standard deviation of 3. Find the value above which there is a .70 probability that an observation will occur?
If you decrease the level of confidence from 90% to 85%, the width of confidence interval will increase by or decrease by what %?
A sampling of 240 students out of 1200 students were selected to study there average test scores. Since the sample size is great than 30, how much error would you expect in finding the average grad