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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. A researcher developed a question that asked, "Do you believe that drug addicts should be treated more severely?" What are the problems with this question?
Determine a 95 % confidence interval for the iron concentration.
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
A fair coin is tossed four times and X is number of heads on first three tosses and Y on last three. What is the joint probability mass function of x and y? What is the marginal pmf? Are X and Y independent?
Suppose adults have basically distributed IQ scores with a mean of 100 and an SD of 15. Find P65, the 65th percentile. Use the Z table.
Your company ships a lot of packages needing quick delivery and short notice. In the past, you have used Speedy Air Delivery Service, but you are beginning to receive complaints from customers who say they are not receiving their packages on time.
She chose the sample of 25 women who were recently married for first time and found average age was 23.5 years. Standard deviation was 3 years. Must null hypothesis be rejected?
Which two types of probability sampling are best suited for business research and statistical data analysis, and why?
Assuming the population variances from both offices are equal, is there evidence of a difference in the mean waiting time between the two offices? Use α = 0.05
The probability of getting a big order currently under negotiation is 0.4. The probability of losing money this quarter is 0.5.
It seems that simulation could handle any situation or study. But is that always true? Discuss instances in which a simulation would be important and useful, and then a situation in which a simulation would not be appropriate.
Suppose that 20 students have registered for course this semester. Determine the probability that two or fewer will withdraw? Determine the probability that exactly four will withdraw?
If campaign can be expected to also to rise the probability of best case scenario to 0.4, is it a good investment.
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