Estimate the standard deviation

Assignment Help Applied Statistics

Reference no: EM13851643

How do the shapes of the t distribution and the z distribution differ? Why do you think we need to use a different distribution when the sample size is small and we have to estimate the standard deviation?

Reference no: EM13851643

Questions Cloud

Estimate the ending inventory for december : Estimate the ending inventory for December 31. 2016.

Determine the meaning of a score on a norm-referenced : How does a researcher determine the meaning of a score on a norm-referenced test such as an IQ test? Why is the use of standardized scores such as z-scores of value to researchers seeking to interpret test results? How might a researcher use a norm-r..

Findand interpret : Suppose that at a blood drive a total of n = 300 participants donate blood, and the blood type for each donor is recorded. A "universal" donor is one who has a blood type of O negative. Though their goal was to have at least 30 universal donors duri..

Describe the disadvantages of a centralized environment : ensure that the new help desk will be able to handle requests and problems from users at any time of the day; this will play an important part in the structure of the help desk. You also have the understanding that the executive management is keen..

Estimate the standard deviation : How do the shapes of the t distribution and the z distribution differ? Why do you think we need to use a different distribution when the sample size is small and we have to estimate the standard deviation?

Assume that the significance level : Assume that the significance level is α=0.05. Use the given information to find the P-value and the critical value(s). The test statistic of z=1.62 is obtained when testing the claim that p>0.7. P-value equals =

Calculate the sample size needed : 1. Calculate the sample size needed given these factors: one-tailed t-test with two independent groups of equal size small effect size (see Piasta, S.B., & Justice, L.M., 2010) alpha =.05

Define the random variable x : A. In a recent sample of 84 used car sales costs, the sample mean was $6,425 with a standard deviation of $3,156. Assume the underlying distribution is approximately normal. a. Which distribution should you use for this problem? Explain your choice...

What is the pressure drop across the pipe : what is the pressure drop across the pipe? what is the shear stress exerted on the pipe boundary? what is the shear velocity? what is the darcy friction factor?

User Account

All Pages