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Probability of a type I error and type II error:
In a large experiment to determine the success of a new drug, 400 patients with a certain disease are to be given the drug. If more than 300 and less than 340 patients are cured. We shall conclude that drug is over 80% effective. Find the probability of committing a type I error. What is the probability of a type II error (β) error If the new drug is only 70% effective.
Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study
Which of the following would produce a new confidence interval with smaller width based on these same data and produce a new confidence interval
A coin is flipped e times and heads (h) or tails (t) are recorded:
As it is a 2 _ 2 table, try also two-tailed two-sample z test for ð1 = ð2 and verify that z2 is same as your chi-square statistic. Which test do you favour? Describe why?
To test the difference between two means using two mean z test.
Be sure to include information about how you would use the concept of probabilities to apply to profiles for hiring more satisfied individuals.
If the computed value for this problem is +2.33, and the level of significance is 0.05, can we conclude that the recall proportions for the two commercials are same?
Which of the following studies used a participant observer approach?
What is the probability that the mean contents of a six-pack are less than 12 ounces and what is the chance I find at most two defectives in the sample
Some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and soil treatment. An experiment was conducted to compare peach tree seedling growth with soil and weeds treated with one of two her..
An experiment was conducted to determine the effects of three different pesticides (P1,P2,P3) on the yield of three different varieties of citrus tree (V1,V2,V3).
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
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