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1.Medical tests were conducted to learn about drug-resistant tuberculosis. Of 142 cases testedin New Jersey, 9 were found to be drug-resistant. Of 268 cases tested in Texas, 12 were foundto be drug-resistant. Do these data suggest a statistically significant difference between theproportions of drug-resistant cases in the two states? Use a .02 level of significance. What is the p-value, and what is your conclusion?
Finding the Equation of the Regression Line and Making Predictions. Find the regression equation,
A population has a standard deviation of 16. If a sample of size 64 is selected from this population, what is the probability that the sample mean will be within 2 of the population mean?
Assume that respondents had been asked for party affiliation in a poll. THe responses were coded as 0 (for democra), 1 (for republican), 2 (for independent), or 3 (for any other response).
Identify a research issue, problem, or opportunity that uses data that has absolute zero measurements, ratio level data.
A newspaper ad for a manager trainee position contained the statement "Our manager trainees have a first-year earnings average of $20,000 to $24,000." Do you think that the ad is describing a confidence interval? Explain your answer.
Assume the chief does not want his officers to cite a car for speeding unless they are 99% sure that it is travelling at 58 miles per hour or faster. What is the minimum estimate of speed at which a car should be cited for speeding?
Is it sensible to conclude that this set of n=16 people is not representative random sample of registered voters?
Describe the sampling distribution of p-hat, the sample proportion of college students with the cell phones who send or receive the text messages with their phones.
Explain how significance is determined in simple terms as well and define a statistical interaction and how it affects your results. Give an example. List the variables that are interacting and why.
If we want to estimate the selling price on the basis of age, which variable is the dependent and which is the independent? Draw a scatter diagram.
The heart rate in beats per minutes of 30 randomly selected students are given below: 78 64 69 75 80 63 70 72 72 68 77 71 74 84 70 62 67 71 69 58 74 70 80 80 63 88 60 68 69 70 71. Is it normal distribution or find the normal distribution.
In a normal frequency distribution, 32% of the cases:
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