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The Department of Transportation reported Amtrak trains had a 78% on-time arrival record over the previous 12 months (USA Today, November 23, 1998). Assume that in 2001, a study found 330 of 400 Amtrak trains arrived on time. Does the sample indicate the Amtrak arrival rate has changed? Test at a 95% confidence interval. What is the Hypotheses and idicate what is the sample proportion. What is the P-value and, in turn, what is your conclusion? Accept Reject?
What percent of the time will a fully charged battery last at least 330 minutes. What is the probability that a random sample of n = 15 batteries results in a mean talk time of at least 330 minutes?
This information was also obtained from monitored calls. At the .05 significance level does it take longer to resolve software issues? What is the p-value?
Draw a bell curve for each one of the following normal probability distributions: the standard, the sat and Binet Intelligence scale. Draw a separate bell curve for each one.
Based on your analysis, how is the new bottling process working?
Use a 0.05 significance level to test the claim that the mean speed of all cars is greater than the posted speed limit of 70 mph. Based on the above situation compute the value of the test statistic.
A female offspring has no chance of inheriting the disease. Further suppose that 51.3% of births are male. What is the probability that a randomly chosen child will be affected by the disease?
The random variable x has a normal distribution with mean=30 and standard deviation = 30. Find the probability that x assumes a value more than two standard deviations from its mean more than three standard deviations from the mean.
Sampling variability refers to the idea that different samples will include different individuals
Determine the point estimate in this study? Compute the standard error in this example?
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
The mean amount purchased by a typical customer at Churchill\'s Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the foll..
If they enroll this many pupils, how much would they need to charge per pupils in order to realize their profit goal of $5,000.
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