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Vehicles heading west on Front Street may turn right, left, or go straight ahead at Elm Street. The city traffic engineer believes that half of the vehicles will continue straight through the intersection. Of the remaining half, equal proportions will turn right and left. Two hundred vehicles were observed, with the following results. Can we conclude that the traffic engineer is correct? Use the .10 significance level.
Straight Right Turn Left Turn
Frequency 112 48 40
Morality Study for a group of four men, the probability distribution for the number x who live through the next year is as given in the accompanying table.
Construct a 95% confidence interval estimate for the population proportion of administrative professionals who prefer cash bonuses.
Ace Machine Works estimates that the probability its lathe tool is properly adjusted is 0.8. When the lathe is properly adjusted, there is a 0.9 probability that the parts produced pass inspection.
Converting data to indexes makes it easier to compare the trend in a series composed of exceptionally large numbers.
List all samples of size 2, and compute the mean of each sample. Compute the mean of the distribution of sample means and the population mean. Compare the two values. Compare the dispersion in the population with that of the sample means.
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
Compute the 95% confidence interval on the population mean if a sample of 1000 is taken and the sample mean is found to be 15.95 and standard deviation is 4.2.
A study of 35 golfers showed that their averages score on a particular course was 92. The standard deviation of the sample is 5.
Determine the probability of randomly selecting a person graduating with Master's degree who didn't major in Education.
Consider the experiment of rolling a pair of dice. Suppose that we are interested in the sum of the face values showing on the dice.
Describe whether the data appear to be approximately normally distrusted by .. a. Comparing data characteristics to theoretical properties.
As a part of the feasibility study, they wish to estimate the mean weekly child-care cost of their employees. A sample of 10 employees who use child care reveals the following amounts spent last week.
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