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Identify which sampling technique was used in the following study:
A journalist asks 17 friends about their opinion on the last World Series baseball game.
a. systematic sampling
b. cluster sampling
c. convenience sampling
d. stratified sampling
Twelve cases of leukemia are reported in people living in a particular census tract over a 5-year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
sample of 100 measurements were taken to analyze concentration of impurities in a product. calculated sample mean was
Part variability is critical in the manufacturing of ball bearings. Large variances in the size of the ball bearings cause bearing failure and rapid wearout.
question 1. examined the effect of body position on blood pressure 32 participants had their blood pressures measured
Let X be a random variable uniformly distributed on the interval (0,1). Let Y be a new random variable defined as Y = X2. What is the probability density function of Y given by?
(a) What value would you expect to find for the mean of all these sample means? (Give your answer correct to nearest whole number.)
Compute the standard error of the proportion and calculate the z-statistic. What is the probability of obtaining this value of the z-statistic if the null hypothesis is true?
What is the probability that a cereal would both high calorie and high fiber? In other words, what is P (high calorie and high fiber)?
Assume there are 18 homes in the Quail Creek area and 9 of them have a security system. Five homes are selected at random: what is the probability all five of the selected homes have a security system?
From past information, it is known that the standard deviation of the population is 22 mph. The 96.6% confidence interval for m is?
What are the expected values for each alternative?
Test the proportions of yellow fire trucks have a significantly lower accident rate.
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