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Calls to a customer service center last on average 1.8 minutes with a standard deviation of 1.5 minutes. An operator in the call center is required to answer 94 calls each day. Assume the call times
One environmental group did a study of recycling habits in a California community. It found that 72% of the aluminum cans sold in the area were recycled. (Round your answers to four decimal places.)
For each of the following statements, give the null hypothesis (Ho), and the alternate hypothesis (H1).
In a large American university in 1969, the male and female professors were sample independently, yielding the following annual salaries (in thousand of dollars):
A machine fills cans of soda which are labeled "12 ounces" according to a normal distribution with mean 12.1 ounces and standard deviation 0.1 ounces. If I buy a 12-pack of the soda, what is the sta
What is a research question that you would like to answer? Write the null and research hypotheses. Would you use a one- or two-tailed test? Why?
A trucking firm delivers appliances for a large retail operation. The packages (or crates) have a mean weight of 298 lb. and a variance of 2704. (Give your answers correct to four decimal places.)
One of the requirements of a probability distribution is that the sum of the probabilities must be 1 (with a small amount of leeway alowed for rounding errors). what is the justification for this re
The mean clotting time of blood is 7.35 seconds, with a standard deviation of 0.35 seconds. What is the probability that blood clotting time will be less than 7 seconds?
Blair is almost sure that his monthly costs for the past year are not representative of his average monthly costs over the past 20 years.
The mean healing time for these subjects is days. We will assume that the standard deviation is days. So, with a significance level of .05, can we conclude that the population mean (for those treate
What do we mean when we say that a statistical result is significant? What is the difference between a statistically significant and a meaningful result? Why is statistical significance important?
In a random sample 25 days, Jon removes an average of 1588 pounds of waste per day. With a .05 level of significance, can we conclude that the population mean amount of crap Jon disposes of per day
Are the Smith third graders better at math than third graders throughout the state? Perform the correct statistical test, applying the eight steps of the hypothesis testing process and give examples
Six individuals, including A and B, take seats around a circular table in a completely random fashion. Suppose the seats are numbered 1, . . . , 6. Let X =A's seat number andY = B's seat number. If
A website manager has noticed that during the evening hours, about 3 people per minute check out from their shopping cart and make an online purchase. She believes that each purchase is independent
Suppose a machine's life time ( in years ) can be moldeled with an exponential distribution with rate of lambda = 1/4. What is the proability that the machine will last for at least 7 years, give that
A catalyst researcher states that the diameter, in microns, of the pores in a new product she has made have exponential distribution with parameter lambda= 0.25.
A major issue facing many states is whether to legalize casino gambling. Suppose the governor of one state believes that more than 55% of the state's registered voters would favor some form of legal
Using a level of significent a=.01 find the critical value explain whether or not you would accept the null hypothesis using both the critical value approach and the p-value approach and why.
What is your margin of error. What is the CI based on your margin of error. Suppose you wanted to develop a 95% Ci repeat parts a and b for a 95% Ci.
Find the indicated probabilities using the geometric distribution or Poisson distribution. Then determine if the events are unusual. If convenient, use a Poisson probability table tor technology to
Fifty percent of households say that they would feel secure if they had $50,000 in savings. You randomly select 8 households andask them if they would feel secure if they had $50,000 in savings. Fin
A sample of 145 values is randomly selected from a population with mean equal to 43 and standard deviation equal to 19. (Give your answers correct to one decimal place.)