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In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that:
(A) exactly four will have this mild side effect
(B) at least seven will have this mild side effect.
Calculate the sample mean and sample standard deviation.
The population mean of a company's racing bicycles is 9.07 kg (20.0 lb) with a population standard deviation of 0.40 kg. If the distribution is approximately normal
Assume the researcher's rats can be considered an SRS from the population of all laboratory rats. The mean Math SAT score of these students is found to be 560, 80 points higher than the national average.
Suppose that beer consumption and religious affiliation are not independent of each other. That means that
Graph one shows a number of observations that all are directly on trend line that moves from the top left of the graph to the bottom right.
Events A and B are mutually exclusive events defined on common sample space. If P (A) 0.5 and P (A or B) = 0.70, determine P (B).
What does central limit theorem say about distribution of John's average payoff after 365 bets in a year?
Which test do we use to see if the difference in our sample is statistically significant? Why? Should it be one or two-tailed?
It is not unusual for a battery to have life span that is more than 2470 hours as the z-score is within 2 standard deviations of mean.
From a previous study, the standard deviation of the ages is known to be 3 years.
A job placement director claims that the average starting salary for nurses is 24,000.A sample of 10 nurses' salaries has a mean of 23, 450 and a standard deviation of 400. Is there enough evidence to reject the director's claim at 0.05 level of s..
A digital camcorder repair service has set a goal not to exceed an average of 5 working days from the time the unit is brought in to the time repairs are completed. A random sample of 12 repair records showed the following repair (in days)
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