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Physicians at a clinic gave what they thought were drugs to 920 asthma, ulcer, and herpes patients. Although the doctors later learned that the drugs were really placebos, 52 % of the patients reported an improved condition. Assume that if the placebo is ineffective, the probability of a patients condition improving is 0.48. For the hypotheses that the proportion who improve is 0.48 against that it is greater than 0.48, find the P-value.
P-value =
The standard deviate of fresh fruit consumption is about 30 pounds. Suppose a researcher took a random sample of 38 people and had them keep a record of the fresh fruit they ate for one year.
A company has developed the new battery, but the average lifetime is unknown. In order to estimate the average, a sample of 150 batteries is tested and an average lifetime of this sample is found to be 250 hours.
Distributed with the following parameters: μ1 = 100, σ1 = 4, μ2 = 75, σ2 = 4, μ3 = 75, and σ3 = 2. What is the probability that an assembly chosen at random will have combined dimension in excess of 262?
How many different combinations of the clients could be considered for inclusion into his limited schedule for that day?
Construct the confidence interval to find the estimated margin of error. Then find the sample mean - A biologist reports a confidence interval of (3.3,4.5) when estimating the mean height (in centimeters) of a sample of seedlings.
In rectangular coordinate system, determine the distance between the points (-4,1) and (8,6).
Compute and explain a 90% confidence interval for the population proportion of executives who believe the U.S. legal system hampers the ability to compete.
Can researcher conclude that humidity has significant effect on eating behavior? Use two-tail test with α = .05. Calculate estimated Cohen's d and r2 to measure size of treatment effect.
in an experiment to study the relationship of hypertension and smoking habits the following data are collected for 180
the average hourly wage of workers at a car wash is 6.50hr. assume the wages are normally distributed with a
Find a 90% confidence interval for the population mean weight of all such turtles.
Compute standard error of mean? Compute the margin of error, with 95% confidence.
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