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Q1) A public bus company official claims that mean waiting time for bus number 14 during peak hours is less than 10 minutes. Karen took bus number 14 in peak hours on 18 different occasions. Her mean waiting time was 7.2 minutes with standard deviation of 1.6 minutes. At 0.01 significance level, test claim that the mean is less than 10 minutes. You may suppose that time spent waiting for bus 14 is normally distributed.
According to College Board's report, average tuition and fees at four year private colleges and universities in United States was $20,273 for academic year 2002 - 2003 and standard deviation was $4100. For random sample of 100 four year private U.S. colleges:
a) Compute the mean of the sampling distribution?
b) Compute the standard deviation of sampling distribution?
c) Compute the probability that mean tuition and fees of sample is greater than $20,000?
d) Determine probability that mean tuition and fees of sample is less than $18,000?
e) Compute the probability that mean tuition and fees of sample is within $410 of population mean?
Given that consumer changed te brands, what is the probability that consumer purchased fewer products than before?
Public transportation and the automobile are 2 methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
How much net profit can John expect (on average) to earn from the store in total over the next five years?
What is the probability of receiving more than three pieces of junk mail today?
Find the probability that exactly 15 flights arrive on time.
The variable recorded for each subject was the number of additional yards (possibly negative) that the subject could drive the ball by the end of the season. In the two-way ANOVA the DFM
If it is determined that there is no difference between the population mean being represented by the sample and the mean of the population at large, then:
Suppose the sample variance for 30 parts turns out to be s 2 = .0005. Use α = .05 to test whether the population variance specification is being violated.
Evaluate your histograms for any outliers in your data. Based on your evaluation of outliers, you may trim no more than 1% of the data contained in the data set. This must be done symmetrically (i.e., trimming no more than 0.5% off the top and 0.5..
A researcher used stepwise regression to create regression models to predict Birthrate (births per 1000) using five predictors:
What is the optimal strategy for producing 500 tons of newsprint pulp, 600 tons of packaging pulp, and 300 tons of print stock quality pulp at minimum cost?
What's the probability that among three randomly selected high school students
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