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A sample of final exam scores is normally distributed with a mean equal to 20 and a variance equal to 25. What is the probability of getting a score less than 27?
A) 0.9192
B) 0.8897
C) 0.4192
D) 0.3897
E) 0.8397
A business owner decides to use a binomial distribution to solve one of his problems. He knows there is a 60 percent probability that he will sell one of his Red Oak floors to any customer who comes into his shop and views the wood.
Given what you've learned in this module about the meaning of "statistics", choose one of the examples from Part I (A-F), and raise a relevant question of your own that could be answered by a statistician.
A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the company is currently producing has a normal distribution with an average of 7.5 minutes and a standard deviation of 1.2 minutes.
What is the F critical value to be used at the 0.05 level of significance with 7 numerator degrees of freedom and 12 denominator degrees of freedom?
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level. Give the formula for the test statistic.
The manager of a local branch of a bank believes that over the past few years the bank has begun to cater to a different clientele and that the average amount withdrawn from its ATMs is no longer $140.00.
A new industrial oven has just been installed at the Piatt Bakery. To develop experience regarding the oven temperature, an inspector reads the temperature at four different places inside the oven each half hour.
The sample mean is 60 kilograms (kg). Suppose that the mean weights of male runners follow a normal distribution with unknown mean mu and standard deviation of 5 kg (sigma). What is the 95% confidence interval for mu?
The professor plots a histogram of these several proportions. Should a Normal model be used to represent the sampling distribution of the proportion of tails?
Calculate the standard deviation of the ages of the uninsured senior citizens correct to the nearest hundredth of a year.
Graph the distribution using a histogram. Calculate the mean and standard deviation.
Use the .02 significance level. 2. The decision rule is to reject H0 if Z greater than ___? 3. Compute the value of the test statistic. The test statistic is Z=___. 4. What is the p value?
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