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Suppose duration of human pregnancies are somewhat skewed with a mean of 262 days and a standard deviation of 15 days. Suppose a certain obstetrician is currently providing prenatal care to 40 pregnant women. Let bar-y represent the mean length of their pregnancies.
Is the distribution of sample means normal or not normal?
What is the value of sigma bar-y? (carry two decimals)
Suppose the obstetrician provided prenatal care to 45 pregnant women instead. How would this change the mean of the dirstibution of sample means? (smaller, larger or no change)
How would this change the standard deviation of sample means?
Mean and standard deviation are 584.6 and 34.28
A recent survey of 50 executives who were laid off durning a recent recession revealed it took a mean of 26 weeks for them to find another position. The standard deviation of the sample was 6.2 weeks. Construct a 95 percent confidence interval for..
What is the difference between the probability value and the significance level? Please, also provide examples.
The number of traffic accidents that occurs on particular stretch roas during a month follows a Poisson distribution with mean of 8.5. Find the probability of observing exactly three accidents of this stretch of road next month.
For a binomial probability experiment, with n=150 and p=.2, it is appropriate to use the normal approximation to the binomial distribution.
Based on the following results, is LIFO more effective in keeping the value of his inventory lower? Product FIFO LIFO. What is the null hypothesis?
for each of the following statements give the null hypothesis ho and the alternate hypothesis h1.1. the mean average
List one unclear concept regarding regression and provide an example from your personal or work life where regression could be used to show a relationship between two variables.
the poll claims that 70 of the population is for a new amendment. a random sample of 49 people showed that 27 voted in
The manager of Petroco service station wants to forecast the demand for unleaded gasoline next month so that the proper number of gallons can be ordered from the distributor.
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%. The researcher gathers a random sample of 120 individuals who live in the California and finds tha..
Suppose that X is a discrete random variable with probability mass function: PX(x)= (1/2)^((2x/ pi)+1) , where x =0, pi/2, pi, 3pi/2, 2pi... , and equals to 0 otherwise.
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