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Hospital workers who are routinely involved administrative radioactive tracer to patients are subject to a radiation exposure emanating from skin of the patient. In an experiment to asses the amount of this , radiation levels were measured at a distance of 50 cm from n=28 patients who had been injected with a radioactive tracer , and a sample mean of 5.145 and sample std. s= 0.7524 are obtained. Can we be confident that the average radiation level at a 50 cm distance from patient is no more than about 5.5?
q1. in a game of chance a number of draws are placed with replacements from a box of tickets 500 of these tickets are
Standard Normal Distribution Table
A beverage company is trying to ?nd out the distribution of the breaking strength of their glass bottles. Fifty bottles are selected at random and tested for breaking strength, with the following results (in pounds per square inch):
use the fact that the standard normal distribution integrates to 1 to evaluate the following integral. i.e. useintegral
Were there significant differences between the groups. Give the relevant stastical data to support your answer and what is the confidence interval associated with your answer to item # 1?
400 people are chosen from a large population that is 50% women. How likely is it that the sample has only 180 women or fewer? What is the value of the test statistic z?
stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices. A sample of 500 sales invoices is needed. What type of sampling should you do? Why?
Perform exploratory data analysis on CreativityPre and CreativityPost. Using SPSS, calculate the mean and standard deviation of these two variables.
Test the assumption of collinearity.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank-sum test, evaluate the significance of the results, assuming there are no ties.
A university wants to determine the proportion of students who use a cash card to pay at the university food service. Out of 100 students surveyed, 65 students use a cash card. Estimate the value of the population proportion.
Calculate the measures of central tendency, dispersion, and skew for your data. Display your descriptive statistical data using graphic and tabular techniques.
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