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Which test again? For each of the following situations, state whether you'd use a chi-square goodness of-fit test, a chi-square test of homogeneity, a chi-square test of independence, or some other statistical test:
a) Is the quality of a car affected by what day it was built? A car manufacturer examines a random sample of the warranty claims filed over the past two years to test whether defects are randomly distributed across days of the work week.
b) A medical researcher wants to know if blood cholesterol level is related to heart disease. She examines a database of 10,000 patients, testing whether the cholesterol level (in milligrams) is related to whether or not a person has heart disease.
c) A student wants to find out whether political leaning (liberal, moderate, or conservative) is related to choice of major. He surveys 500 randomly chosen students and performs a test.
a researcher selects a sample from a population with m 30 and uses the sample to evaluate the effect of a treatment.
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
1 true or false a t-statistic estimates the standard error by using the sample variance to approximate the population
the following is a set of data from a sample of n 11 items x 7 5 8 3 6 10 12 4 9 15 18 y 21 15 24 9 18 30 36 12 27 45
for each of the following two problems analyze the data given in the related data le. write up your results in the
a perfect gas flows through an insulated passage with no shaft work. the entering conditions are t1 290 kp1 350 kpa
At the end of the week, the scientists said that 18% of the 234 fish that were submitted for inspection displayed the discoloration. From this information, can the researchers estimate what proportion of fish in the river have discolored scales? E..
For the following variables identify their level of measurement and whether the variable is discrete or continuous. Ex. What is your Zodiac sign. Ex How many pets do you own?
One car is selected at random from the cars with vehicle tags from these cities. What is the probability that this car is from Salem?
Assume you have noted the following prices for paperback books and the number of pages that each book contains.
At a recent meeting of educational researchers comparison were made between the type of college freshmen attend and the numbers who drop out.
Write down the probability distribution of X, the insurance company's annual gain from such a policy (i.e., the amount of money made by the insurance company from such a policy).
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