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12% of those eligible for jury duty are left handed. Among 250 people selected for jury duty, 25 (0r 10%) are lefties. find the probability of getting at most 25 lefties assuming that they are chosen with a process designed to yield a 12% rate of lefties.
When the growing season is moderate. The probability of the growing season being too dry is 35%. What is the expectation for profit?
If Stocks 1 and 2 have expected returns of 9 percent and 10 percent per year, respectively, then what is the minimum expected annual return for Stock 3 that will enable Glenda to achieve her investment requirement?
Calculate the appropriate test statistic to test the hypotheses related to the concern and test at 5% and 1% (indicate which test you are performing; show the hypotheses, the test statistic and the critical values and mention whether one-tailed or..
In drawing an inference using a single mean in hypothesis testing, you often have a choice between doing a z-test or a t-test. Many researchers will always choose to do the t-test even under circumstances where the z-test would work as well.
Let's suppose that we have 2 variables year and age.. I use STATA to make them into dummy variables as follows:
Assume that samples of size 2 are randomly selected with replacement from this population of four values. The first samples selected is 11,9. What is the mean of the sampling distribution of means?
As a part of their testing program Sony tests samples of 25 batteries. What can you say about the shape of the distribution of sample mean?
A researcher determines that 42.7% of all downtown office buildings have ventilation problems. Is this a statistic or a parameter; explain your answer.
Construct and interpret 90 percent on confidence interval for the mean. Be sure to interpret the meaning of this interval.
We desire to test at 0.05 level of significance whether modification increases the life of battery. What is our decision rule? Reject null hypothesis if calculated t is less than 1.96.
Ten asthmatics were asked to compare the effect of salbutamol and fenoterol sprays in relieving their asthma attacks. Assume that salbutamol and fenoterol are equal in terms of effectiveness and side effects in all people
Estimate the mean height to within 3cm with 95% confidence. Assume the population standard deviation is about 12cm. What sample size should she use?
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