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Given a normally distributed population, a sampling distribution is summarized by mean=50, n=100 and standard deviation=15. what is the probability that a simple random sample will reveal a sample mean
1. between 53 and 63
2. below 30
3. above 63
4. between 30 and 45
5. between 40 and 63.
the mean per capita income is 17635 dollars per annum with a standard deviation of 891. what is the probability that
At the end of the training program, the attitude of each trainee was measured on a 100-pt. scale (the lower the score, the poorer the attitude). How many treatments are in this experiment?
At.01 significance level, can we conclude that there is more variation in selling prices of oceanfront homes?
the scholastic aptitude test sat is standardized to be normally distributed with a population mean of 500. a parent is
Suppose sps professors have an average life normally distributed of 82 years, with a population standard deviation of 5 years.
calculating probabilitya sample of 400 large companies showed that 120 of them offer free health fitness centers to
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?
The standard deviation is around 2.8. How many students should be sampled to be within 0.5 drink of population mean with 95% probability?
an urn contains three red balls and four black ones. the two balls are drawn at random without replacement. the random
Which of the following best expresses the value of using percentages in data presentation? A. Provides for the calculation of marginals.
the estimate of the population proportion is to be within plus or minus 0.02 with a 90 level of confidence. the best
in an effort to determine whether any correlation exists between the price of stocks of airlines an analyst sampled six
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