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In the study of fingerprints, an important quantitative characteristic is the total ridge count for the 10 fingers of the individual. Suppose that the total ridge counts of individuals in a certain population are approximately normally distributed with a mean of 140 and a standard deviation of 50.
Find the probability that an individual picked at random from this population will have a ridge count of 200 or more.
In a population of 10,000 people how many would you expect to have a ridge count of 200 or more?
At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
What does standard deviation measure? In looking at the standard deviations of the "with fireplace" and "without fireplace" selling prices, one is much larger than the other.
The following time series data represent the yearly amounts spent on advertising (in millions of dollars) by a large toy company:
What proportion of sample means would be between 1.31 and 1.33 inches?
A sample of 16 patients in a doctors office showed that they had to wait an average of 43 minutes with a standard deviation of 8 minutes before they could see doctor. Provide a 99% confidence interval for the average waiting time for all of the pa..
Construct a test of 20 objective type items in your subject. Administer test to a group of 50 students conduct an item analysis and write a report. Explain the meaning of co-efficient of correlation. Why does the homogeneity and heterogeneity of sco..
At.05 level of significance can director conclude that there is difference in the number of circuit cards bought by month?
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots. A partial ANOVA table
Most businesses use some form of linear regression in forecasting future conditions. Give an example of the use of regression analysis at your organization. What were the independent and dependent variables?
A store has an average of 25 people arriving each minute to checkout and each person on the average require 4 minutes to be processed at the checkout. What is the minimum number of cashiers required?
A recent election return indicated that 55% voted for a proposal, 40% voted against it, and 5% abstained. What is the probability that a voter either abstained or voted against the proposal?
Let A be the event that a student is enrolled in an accounting course, and let S be the event that a student is enrolled in a statistics course.
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