Find the probability that a lorry-load
A lorry load consists of 16 boxes, randomly chosen. Find the probability that a lorry-load will include at most 2 boxes which are substandard, giving three decimal places in your answer. Ans: 0.043
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The first 10 subjects who volunteer are assigned to the massed-practice condition; the next 10 are assigned to the spaced-practice condition. Discuss the consequences and seriousness of each of the following two kinds of non-random sampling:
In a report on high school graduation, it was stated that 85% of high school students graduate. Suppose 3 high school students are randomly selected from different schools. What is the probability that all are graduate?
The research department at the home office of New Hampshire Insurance conducts ongoing research on the causes of automobile accidents, the characteristics of the drivers, and so on. A random sample of 400 policies written on single persons reveale
Manufactured articles are packed in boxes each containing 200 articles, and on average 1.5% of all articles manufactured are defective. A box which contains 4 or more defective articles is substandard. Using a suitable approximation show that the
At the .05 significance level, is there a difference in the number of rounds played by day of the week?
Could you conclude that John Jay Professors live longer than average? Use the appropriate two-tailed test with an a = 0.05. Also, construct a 95% confidence interval. Do the statistical test and the confidence interval agree? Write up your results
A random sample of 20 items from the first population showed a mean of 100 and a standard deviation of 15. A sample of 16 items for the second population showed a mean of 94 and a standard deviation of 8. Find the degrees of freedom for unequal va
An auditor of a small business has samples 70 of 900 accounts. The sample mean total receivable is $444, and the sample standard deviation is $89. Find a 98% confidence interval for the total amount of receivables.
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