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Find the value of t α/2 and n = 18 for the 99% confidence interval .B. find the value of t α/2 and n = 15 for the 98% confidence interval.
Find the probability that for a randomly selected office hour, the number of student arrivals is 3. (b) What is the probability that he will get at most 5 students in a randomly selected office hour?
The random variable x is known to be uniformly distributed between 1.0 and 1.5.
Given the sample size of 36 bolts with a mean of 3 inches and a standard diviation of .3. What is the 99% confidence interval for the true mean length of the bolt.
What is the probability that of today's 1,100 callers at least 5 received a busy signal? Use the poisson approximation to the binomial.
Using the p- value approach, test the hypotheses at the 5% level of significance.
A random sample of 400 observations produced a sample proportion of 0.32. What is the standard error to construct a 99.5% confidence interval.
Following a lognormal distribution with a mean of 3000 rpm and std deviation of 0.87, what if the boss want a 5% chance of HW failure before selling, how often would I have to replace this hardware ?
Explore the descriptive statistics and draw some scatter plots. Does this meet the basic assumptions of regression?
First explain what the Gini coefficient is and what hypothetical Gini values of 0 and 1 mean. Sort the data by the Gini coefficient in 2000 and look at the list of countries.
Determine the probability distribution for X defined as number of defective items drawn (Hint: You have to determine P(X=0), P(X=1) and P(X=2).
The number of children, x, belonging to each of eight families registering for swimming was 2, 2, 2, 4, 2, 1, 2, 2. Find the mean, x. (Give answer correct to 2 decimal places.)
Assume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown.
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