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What is the mean and variance of the number of defectives of the sample in part b) ? [ ] d. If we were to check the fuses one by one then, i) What is the probability of getting the first defective fuse? [ ] ii) What is the probability of getting the 4th defective fuse on the 8 trial? 5) In the daily production of a certain kind of wire, the number of defects per foot Y is assumed to have a Poisson distribution with mean = 2. i) What is the probability of observing 3 defects in 4 feet of wire?
Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Test at the .05 level of significance.
Is it necessary to know anything about the shape of the distribution of the account balances in order to make an interval estimate of the mean of all the account balances?
There were 1000 more students at the soccer game than nonstudents. Student tickets were $8.50 and nonstudents were $13.25. If the total revenue for the game was $75,925, then how many tickets of each type were sold?
Using the dataset, produce a graph of per capita GDP for Argentina, China, and Canada from 1965 to 1995. Is inequality between these countries increasing?
State the null and alternate hypotheses. Calculate the sample standard deviation. Determine which test statistic is appropriate (chi-square or F), and calculate its value.
The least squares simple linear regression line minimizes the sum of the vertical deviations between the line and the data points.
At the .05 significance level, can we conclude that the guideline is still reasonable?
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability the sample mean is
Describe a situation that might be viewed differently by two people. This event can be as minor as an encounter on the street or as major as the birth of a child.
The following data represent glucose blood levels(mg/100ml) after a 12 hour fast for random sample of 70 women: Employ 6 classes and make a frequency distribution table.
How many bolts should be sampled in order to make us 95% confident that the sample mean bolt length is within .02 inches of the true mean bolt length?
How large a sample should we take if we wish the 95% margin of error to be plus or minus $15.00. Assume from previous studies that the standard deviation is $120.
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