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A large internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days.
Lead Time (days) Frequency
0 up to 5 6
5 up to 10 7
10 up to 15 12
15 up to 20 8
20 up to 25 7
Total 40
a. How many orders were placed?
b. What is the midpoint of the first class?
c. Draw a histogram.
Two events are mutually exclusive: If their intersection is 1, If they have no sample points in common.
X is a continuous random variable uniformly distributed on [20, 45] that is, the end points c = 20 and d = 45.
Given that this sample is extremely large, can the responses be considered to be representative of the population of the United States? Explain.
A researcher is comparing two antihypertensive drugs A and B with regards to reduction of patient's systolic blood pressure (SBP). Baseline SBP is measured for two groups of patients.
Can one conclude at a level of significance of .01 that the new ball has improved his game?
What kind of probability uses sample spaces to find out numerical probability that event will happen?
The average number of days absent per student per year at West Valley School is 17 days with a standard deviation of 4 days. How many standard deviations from the mean is 6 absent days?
Hours worked is important predictor of amount of sales.
The probability of getting a promotion and a raise is 0.25. What is the probability of getting a raise.
a) Compute a 95% Confidence Interval for the true population proportion of successes. b) Based on this analysis can you conclude that the new system meets the requirement? Explain your conclusion.
State the null and alternative hypotheses you would use to test whether the year-end bonuses paid by Jones & Ryan were different from the population mean.
Girl B throws 15 times, with a prob. of success = 0.2. And girl C throws 20 times, with a probability of success equal to 0.1. Determine the probability that the target will get hit at least 12 times.
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