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Prince Edward Island Fisheries and Environment has been feeding a special food to rainbow trout fingerlings in a pond. A sample of the weights of 40 trout revealed that the mean weight is 402.7 grams and the standard deviation 8.8 grams. What is the probability that the mean weight for a sample of 40 trout exceeds 405.5 grams?
A survey of 200 recent graduates from your school revealed that 80 students had jobs. At the .02 significance level, can we conclude that a larger proportion of students at your school have jobs?
Assume that flight times from SAN to ATL are exponentially distributed with a mean of 4.5 hours and a standard deviation of 0.2 hours. Assume that you must fly from SAN to ATL weekly for the lucrative consulting engagement for one year (52 flight..
What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confidence?
According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.
question the appliance centre sells a variety of electronic equipment and home appliances. for the last four years
a random sample of 60 undergraduates of a large university found that 32 were in support of an activity fee increase.
Suppose that 64 smokers were sampled. Assume the sample mean and the sample standard deviation remained the same ($20 and $5, respectively).
Given that he makes first, assume probability that he makes second is 0.60. Given that he misses first, assume probability that he makes second one is 0.40.
What critical value t* from table D should be used to calculate the margin of error for a confidence interval for the mean of the population in each of the following situations?
Compute the value of the test statistic. Determine the p-value; and at 93.7% confidence, test the above hypotheses.
A neuropsychologist compare the auditory abilities of blind versus normally sighted rats. He predicted that the visually impaired rats would have better auditory development than normally sighted rats.
X is a normally distributed random variable with mean 10 and variance 24. a. Find P(X bigger 14) b. find P(8 smaller X smaller 20)
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