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A researcher knows the weights of six-year olds are normally distributed with a μ=20.9 kg and a σ=3.2, she suspects that children in poverty-stricken regions are undernourished and therefore underweight. With a sample of n=6 children, the researcher obtains a sample mean of X=18.3 kg. Show values for Z critical and Z calculated. Calculate all values for Z to two decimal places (x.xx)
Using α=.01, use a one-tailed test. State in words what the results are.
The ________ is the probability of observing a sample value as extreme as, or more extreme than the value observed, given that the null hypothesis is true.
Write the null and alternative hypotheses you would use to test the following situation.
The data in below represent the closing value of the Dow Jones Industrial Average (DJIA) over the 29 year period from 1979 through 2007.
The cheetahs' coach believes that the Rockets' times are normally distributed as well. Construct a 95% confidence interval the Coach to compare the two teams' sprint units.
Company wishes to know how many pounds of each chemical ingredient to put into the bag of fertilizer to meet minimum needs of 20 ounces of nitrogen, 36 ounces of phosphate, and 2 ounces of potassium during minimizing cost.
What types of graphical presentation (histogram, dot plot, stem-and-leaf, bar chart, etc.) would you include? Explain your reasoning.
For following two regressions describe and interpret major parts from regression output. write down the difference between two regressions?
A burglar plans his crimes so carefully that the lengths of the burglary are uniformly distributed between 50.0 and 52.0 minutes. Find the probability that a given burglary runs between 51.0 and 51.5 minutes.
The Acme School of Locksmithing has been accredited for the past 15 years. Discuss how this information might be interpreted as a
We are interested in a 95% confidence interval for the population mean score. The margin of error associated with the confidence interval is?
New study is to use 90% confidence level. Estimate is to be within 1 percent of population proportion. Determine the essential sample size?
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
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