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For parts (a) and (b), tell who or what individuals are being studied, identify the variable of interest, and tell whether it is categorical or quantitative; then answer the question in part (c).
a. Adults were surveyed as to whether they were married, single, or divorced.
b. The New York Times reported, state by state, the divorce rate per 1,000 married adults in 2003. The lowest rate was in Massachusetts, with 5.7 divorces per 1,000 married people, and the highest was in Nevada, with 14.6 per 1,000.
c. Assume we have Census data on marital status of people in the United States. Are those people considered to be a sample or a population?
given that 10 of all people are left-handed what is the probability that there will be at least 3 left-handed students
At a colleg , 72% of courses have final exams and 46% of courses require research papers. Suppose that 32% of courses have a research paper and a final exam.
Serum ferritin is used in diagnosing iron deficiency. In a study conducted recently researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6 mg/L. For 26 younger men the sample standard dev..
Exercise 11 The accompanying table gives sample means and standard deviations, each based on n = 6 observations of the refractive index of fiber-optic cable. Construct a control chart, and comment on its appearance
In each of the following cases, decide whether or not a binomial distribution is an appropriate model, and give your reasons.
a refrigerated delivery truck has a load of perishable goods worth 10000. if the refrigeration unit is not cold enough
Find a 99% confidence interval for the proportion of registered users with false phone numbers and explain what it indicates. Use language that a manager could easily understand.
IT appears that over the past 45 years, the number of farms in Australia declined while the average size of farms increased. The following data provided by the Australian Bureau of Agricultural and Resource Economics show five-year interval
Find the 90%, 95% and 99% confidence intervals for the proportion of all voters who favor the issue. How many more voters should we include in the sample if we need to reduce the margin of error by half?
There is a 0.05 probability of thunderstorms in a major U.S. city. If there is a thunderstorm in that city, the probability is 0.28 that a flight departing that major city will be late.
Modify the regular one-sample Wilcoxon W by replacing the ranks 1, 2, 3, 4, 5, 6, 7, 8 by the scores 1, 1, 2, 2, 2, 2, 3, 3, to obtain W1. Compute the mean and variance of W1.
The president of the United States is thought to have a positive approval rating of 58% of the people at a certain time. In a random sample of 1200 people, what is the approximate probability that the number of positive approvals will be at least ..
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