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1. The mean wage is Rs. 75 per day, SD wage is Rs 5 per day for a group of 1000 workers and the same is Rs 60 and Rs 4.5 for the other group of 1500 workers. Find mean and standard deviation for the entire group.
2. Mention the characteristics of Statistics. Explain any two applications of Statistics.
3. Distinguish between primary and secondary data. What are the methods of collecting primary data?
4. Find Karl Pearson's correlation coefficient between the sales and expenses from the data given below:
Sales
(Rs. Lakhs)
50
55
60
65
Expenses (Rs. Lakhs)
11
13
14
16
15
The accompanying two histograms represent the distribution of acceptance rates (percent accepted) among 25 business schools in 1995. The histograms use different class intervals, but are based on the same data. In each class interval, the left endpoi..
A random sample of 17 wolf litters in Ontario, Canada gave an average of x1= 4.9 wolf pups per litter, with estimated sample standard deviation s1 - 1.0.
Test the hypothesis that more than 60 percent of the U.S. senators (of a total 100 senators) favor the president's economic plan, if a sample of 40 showed that 22 favor the plan (use alpha = .05).
Compute the difference scores for following data from repeated-measures study.
A standard deviation of 20. If the seller wishes to have adequate stock 95% of the time, how many of the games must she keep on hand.
A reasearcher wishes to determine whether people with high blood pressure can reduce their blood pressure by following a particular diet. Use the sample data below to test the claim that the treatment population mean is smaller than the control po..
John runs a computer software store. He counted 130 people who walked by his store in a day, 59 of whom came into the store. Of the 59, only 24 bought something in the store.
Make a scatterplot to determine what kind of relationship there seems to be between the two variables. Use the percent of lead removed as the response variable.
In an early study, researchers at an Ivy University found that 33% of the freshmen had received at least one A in their first semester.
motorola used the normal distribution to determine the probability of defects and the number of defects expected in a
Births. Randomly selected births records were obtained and results are listed in the table below (based on data from the National Vital statistics Report,
A competitive school requires an applicant to have an IQ score in the top 10% of adults. What is the cutoff score?
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