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Q-1) An organization monitors many aspects of elementary and secondary education nationwide. Their 1998 numbers are often used as a baseline to assess changes. In 1998 45% of students had not been absent from school even once during the previous month. In the 2000 survey, reponses from 7471 students showed that this figure had slipped to 44%. Perfom the test and find the P value ?
Q-2) A limousine company is concerned with increasing costs of maintaining their fleet of 150 cars. After testing the company found that the emissions system of 18 out of the 21 cars they tested failed to meet pollution control guidelines. They had forecasted costs assuming that a total of 48 cars would need updating to meet the latest guidelines. Is this strong evidence that more than 32% of the fleet might be out of compilance? complete parts a and b :
a- what is the value of test statistic?
b- what is the P value of the test statistic?
The annual returns, in percentages, on stocks A and B for three possible states of the economy are given in the table below.
In order that the sample proportion and the population proportion not differ by more than 0.05 with 95% level of confidence, what sample size should be used?
let the random variable x follow a normal distribution with micro 40 and ? 10. the probability is 0.95 that x is in
A researcher investigating sex role stereotypes and occupational aspirations drew a random sample of 125 female university students.
for the chi-square test for goodness of fit what is the value of df for a test with four categories and a sample of
What is the differences among a proportion, a percentage, and a ratio? How does a non-parametric business scenario differ from a parametric business scenario?
Women's heights are normally distributed with mean 63.6 and standard deviation of 2.5 in. A social organization for tall people has a requirement that women must be at least 70 in tall.
for a population with a mean of micro 60 and a standard deviation of ? 24 find the z-score corresponding to each of
a particular pitching machine is manufactured so that it will throw the ball into the strike zone of a 6-foot batter 90
A consumer is contemplating the purchase of a new compact disc player. A consumer magazine reports data on the major brands. Brand A has lifetime (TA) which is exponentially distributed with m=.02; and Brand B has lifetime
A researcher is interested in studying the relationship between certain driving habits and type of vehicle. He hypothesizes that signaling behavior will be different for drivers of trucks and cars.
The National Center for Health Statistics indicate that 29.9% of a sample of men and 0.5% of a sample of women are 6" or taller. Are these results generally consistent with your calculations?
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