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A supplier of wire cables has determined that the strength of the cables has a normal distribution with mean ? = 2000 pounds and standard deviation ? = 60 pounds. The manager of a construction project has ordered 4000 cables. If the cables to be delivered are selected at random, what percentage of the cables are expected to have a strength less than 1910 pounds?
Explain the double-negative logic of hypothesis testing (eg: a scientist fails to reject the null hypothesis). What is the five-step process for hypothesis testing? Is the order important? Why or why not?
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
a survey conducted by the american automobile association showed that a family of four spends an average of 215.60
State one referenced hypothesis including the three variables (FA as an IV, age as the covariate and RS as the DV)
Calculate the expected value of your portfolio and calculate the expected standard deviation of your portfolio.
1.according to recent reports 30 of americans are now classified as obese. a sample of 800 americans found that 278 of
Construct a distribution to represent the population such that the survey result above may be seen as a sample from the population.
A steel pipe fittings company claims that the yield strength of its nontempered couplings is more variable than that of its tempered couplings. A random sample of nine tempered couplings has a standard deviation of 13.1 megapascals
Assume a linear relationship, use the least square method to find the regression coefficients bo and b1 and Predict the mean kilowatt usage when the average temperature is 50 degrees Fahrenheit.
Find out whether or not right-hemisphere damage results in significantly reduced performance on spatial skills task. Test with alpha set at .05 with one tail.
In exercise identify (a) sample and (b) population. Also, find whether sample is likely to be representative of population.
A major department store chain is planning to open a store in a new city. Five cities are being considered: Boston, Atlanta, Dallas, Cleveland, and Los Angeles.
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