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Question 1:
X is normally distributed with a mean of 250 and a standard deviation of 40. What value of X does only the top 15% exceed?
Question 2:
Travelbyus is an Internet-based travel agency wherein customers can see videos of the cities they plan to visit. The number of hits daily is a normally distributed random variable with mean of 10,000 and a standard deviation of 2,400:
a) What is the probability of getting more than 12,000 hits?
b) What is the probability of getting fewer than 9,000 hits?
When the effect of a level for one factor depends on which level of the other factor is present, use: Select one:
Estimate the proportion of customers that will be using food stamps at his store. How large a sample is required to estimate the true proportion to within 3% with 98% confidence?
Find the 90% confidence interval for the variance and standard deviation for the time it takes a state police inspector to check a truck for safety if a sample of 27 trucks has a standard deviation of 6.8 minutes.
Houston is $19,900 and in Los Angelos is $21,800. What is the probability that a brand manager in Houston has a base salary in excess of $100,000?
In a research study, what does statistically significant mean? How are decisions made on data based on significance? What do you do with data that is not significantly different?
If a manufacturer charges 'p' dollars each for shirts, then he expects to sell 2000-100p shirts per week. What polynomial represents the total revenue expected for a week?
A soft-drink manufacturer claims that its 12-ounce cans do not contain, on average, more than 30 calories. A random sample of 16 cans of this soft drink, which were checked for calories
Based on this sample information find out what percent of variation in starting salaries is described by GPA, and find out the equation that would forecast salary from GPA. Give a scatter plot.
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.
Examined the effect of body position on blood pressure
Find the probability that a customer with 2 or more late payments will actually default on his payments and, in light of this probability, criticize the manager's credit plan.
A sample of 40 random weeks finds a weekly loss mean of $3200 with a standard deviation of $750. Test their claim at the a=0.05 level.
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