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1) Kindly explain to me the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented
2) How large would a population have to be for a sample to be appropriate (i.e., rather than measuring the whole population)
In a random sample of 800 customers selected for a short phone interview, 96 have stated that they have received their shipments late. The company's claim is that the percentage of late shipments is at or below 10%.
Finding probability for the given values of the uniform density curve
Scores for men on the verbal portion of the SAT test are normally distributed with a mean 509 and a standard deviation of 112. Randomly selected men are given the Columbia
Suppose also that the mean score on test A is 85, and the standard deviation is 10; the mean score on test B is 90, and the standard deviation is 16; the scores on the two tests have a bivariate normal distribution; and the correlation of the two ..
According to accountemps inc. 48% of all executives believe that employees are most productive on Tuesdays. a random sample of 200 executives is taken for a study.
A part of our research design is the data collection process. We often do this by sampling. Differentiate between random and nonrandom sampling methods.
In a random sample of 10 adults from a nearby county, the mean waste generated per person per day was 4.35 pounds and the standard deviation was 1.88 pounds.
Suppose a statistician chose to test a hypothesis at sigma = 0.01. The critical value for a right-tailed test is +2.33. If the test value were 1.97, what would the decision be?
A carton of 6 batteries contains 2 that are defective and 4 that are good. If we select 3 batteries at random form this carton, what is the probability that the sample contains exactly 1 defective battery?
Find the optimal order quantity and what is the optimal total ordering cost per year vs. what is that cost with the current policy?
In studies examining the effect of humour on interpersonal attraction, McGee and Shevlin (2009) found that an individual's sense of humor had a significant effect on how the individual was perceived by others.
Choose a person aged 19 to 25 years at random and ask, "how many times have you worked out in the past?" Call the response X for short.
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