Q1.A researcher wishing to estimate the proportion of X-ray machines that malfunction and produce excess radiation. A random sample of 40 machines is taken and 12 of the machines malfunction. The problem is to compute the 95% confidence interval on π, the proportion that malfunction in the population. Q2.A manager at a power company monitored […]

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1. Use the normal distribution of SAT critical reading scores for which the mean is 513 and the standard deviation is 120. Assume the variable x is normally distributed.a) What percent of the SAT verbal scores are less than 650? b) If 1000 SAT verbal scores are randomly selected, about how many would you expect […]

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