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1) Suppose the mean test scores for a college enter exam is normally distributed with mean = 78 and standard deviation = 12.
a). If an individual student is selected at random, what is the probability that this student's score is over 80?
b). A classroom of 16 of these students is used as a sample. What is the probability that the class mean is greater than 80?
2) A telemarketer makes a sale on 25% of his calls. If he makes 300 calls in a night, what is the probability that he will make more than 70 sales but less than 90 sales?
3) If 2% of the calls received by BMCC switchboard are wrong numbers. Find the probability that among 210 calls received by BMCC switchboard, 4 will be wrong numbers.
a). Determine in this case whether the conditions for the Poisson approximation to the Binomial distribution are satisfied.
b). If so, please use the Poisson approximation to the binomial distribution to find the probability.
What is the value of the sample test statistic? (Round your answer to three decimal places.) Find theP-value. (Round your answer to four decimal places.)
There is significant evidence at alpha=0.05 t o show that the populations of endotoxin levels in children living varying distances from operating farms are not equal.
The management of White companies considering a new method of assembling its golf cart. Compute which assembly time using the new method is faster.
At.01 level of significance, is proportion of seeds which germinate dependent on seed type?
the probability that a college student is in the normal weight range for hisher height is 0.86. if 20 students are
Consider a chess player participating in a two-game pre-tournament quali?cation series. From past records in such games, it is known that the player has a probability pW = 0.75 of winning, a probability pD = 0.2 of drawing, and a probability pL = ..
assume that a simple random sample has been selected from a normally distributed population and test the given claim.
We want to determine if the proportion of people in the population who believes this is less than 0.75. What is the p-value?
Determine the appropriate statistical tool to test the hypothesis based on the research question - conduct a hypothesis test with a 95% confidence level, using the statistical tool.
a doctor studies the side effects of a drug on a male and female. following data was obtained for a random sample of
Let mi denote the mean number of shots needed for the ?rst hit when player i shoots ?rst, i = 1, 2. Also, let Pi , i = 1, 2, denote the probability that the ?rst hit is by player 1, when player i shoots ?rst.
physicians at a clinic gave what they thought were drugs to 920 asthma ulcer and herpes patients. although the doctors
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