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1) Length of time to complete door assembly on the automobile factory assembly line is normally distributed with mean 6.7 minutes and standard deviation 2.2 minutes. For door selected at random, determine the probability assembly line time will be between 5 and 10 minutes?
2)Manufacturer of new compact car claims he miles per gallon (mpg) for gasoline consumption is mound shaped and symmetric with mean of 25.9 mpg and standard deviation of 9.5 mpg. If 30 such cars are tested, determinethe probability the average mpg achieved by these 30 cars will be greater than 28?
Annual returns, in percentages, on stocks A and B for 3 possible states of economy are given in the table below.
Economy State
Probability
StockA
StockB
Good
0.5
40
20
Average
0.3
Bad
0.2
10
8
3) If one invested in Stock A, what would be expected annual percentage return
4) If one invested in Stock A, Determine standard deviation of percentage return?
Find out the finite population correction (FPC).With a population size of 1,000 and a planned sample size of 200, what is the finite population correction.
During the 2003 season, MLB took steps to speed up the play of baseball games in order to maintain fan interest; the following results come from a sample of 60 games played during the summer of 2002. And a sample of 50 games played during the summ..
Assume 1.5% of antennas on new Nokia cell phones are imperfect. For random sample of 200 antennas, determine the probability that: None of the antennas is defective.
For a sample with standard deviation of 10, a score of X = 44 corresponds to z-score of 0.50. Based on this info, determine the sample mean?
Four properties are randomly selected from each neighborhood and the ratios recorded for each as follows:
Do these data suggest a statistically significance difference between the proportions of drug-resistant cases in the two states? Use a 0.02 level of significance and computed value of 2.37.
A small town has a population of 20,000 people. Among these 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
Describe a specific application of statistics that either has a direct effect on you or your life.
The sales manager had predicted, before the business started, that year 1's sales would be 410 air conditioners. Using exponential smoothing with a weight of alpha = 0.30, develop forecasts for years 2 through 6.
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study so that the two factors are smoking level and gender.
Perform hypothesis testing on one variable's data.
Create a scatter diagram and consider the correlation for the given data. Create a scatter diagram and sketch the line you think best fits the data.
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