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Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level?
Based on our poll what is the margin of error of the proportion of voters favoring the incumbent?
A monthly report to the Texas Department of Health, division of Water Hygiene, contained the following water production data in thousands of gallons:
Explain the independent variable, covariate, and levels (groups) of eah. Also, explain the dependent variable and its associated measurement scale and expected outcome.
Calculate expected value for each decision and choose the best one. Find out how much firm would be eager to pay to a market research firm to gain better information about future market conditions.
A random variable X is normally distributed with mu = 60 and standard XXX = 11. What is zscore for X = 71
Discuss why sampling is essential to many research designs, and why, if done correctly may be more accurate than attempting census measurement.
What is the population from which your sample has been taken? Description of data taken from other sources. Preliminary analysis using histograms, box plots, scatter plots, etc. and investigation of outliers. Do you keep or discard identified outl..
Two groups of students are asked to rank their preference for six types of soft drinks. The following table shows their rankings.
Find the relative risk for moderate beer drinkers as compared to nondrinkers, finds the 95% confidence interval
23% of college students say that they use credit cards because of the rewards program. you randomly select 10 students who say that they use the credit card because of its rewards program.
A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each loation.
A social psychologist has developed a test measure gregariousness. The test is normed so that it has a mean of 70 and a standard deviation of 20, and the gregariousness scores are normally distributed in the population of college students used to ..
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