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1. In preparing a national promotional campaign to raise funds for operation feed the poor, the organizing committee examined previous records of donations to establish if age of a donor, in years, is a factor in the monetary size of the donation received from a donor. The records were arranged into the following contingency table.
Size of Donation/Age
20 - 34
35 - 49
50 - 64
Over 64
Above $100
25
40
47
46
$50 - $100
69
51
74
57
Below $50
36
29
19
37
Can it be concluded that the age of a donor influences the size of the donation to this charity. Test at 2.5% level of significance.
2. The average height of females in the first year post graduate class of a certain college has been 162.5 cm with a standard deviation of 6.9 cm. Is there reason to believe that there has been a change in the average height if a random sample of fifteen females in the present first year class has an average height of 165.2 cm? Test at 5% level of significance.
400 had college degrees, 100 were single, and 60 were single college graduates. The probability that an employee of the company is married and has a college degree is?
Because its fixtures are attached to the ceiling, the bulbs are rather cumbersome to replace, and Shop-Mart is looking into the possibility of switching to Phipps bulbs, which cost the same. A sample of Phipps bulbs lasted an average of 2080 hours..
A large population of overdue bills has balances that follow a normal curve. When we take a sample of 100 of these the average is $500 and the SD is $100.
What are the chances of getting 15 days of rain during the next 30 days? What do you think about Joe's assumptions concerning the weather for the next 30 days?
Girls' cross-country times: a contrast (optional). Continue your analysis of the data from the previous problem by comparing average race time during the first half of the season with the average for the second half.
Create a 95%confidence interval for the value of the population mean, given that their is a sample mean of 49 and a standard deviation of 3 but now found those valuesfrom a sample of only 20 observations.test the hypothesis allowing for type 1 error ..
consider the following. give your answers correct to two decimal places.a find the standard score z such that the area
The mean annual salary paid to all employees in a company was EURO 30.000. The mean annual salaries paid to male and female employees of the company were EURO 32.000, and 24.000, respectively. Determine the percentage of males and females employed..
the computer-science aptitude score x and the achievement score y measured by a comprehensive final were measured for
If the total weight of the two bags, X1 + X2 exceeds 105.4 pounds, a surcharge is added onto the shipping cost. What percentage of all shipments can be expected to result in a surcharge being added to the shipping cost?
an experiment involves selecting a random sample of 283 middle managers study. one item of interest is their mean
A researcher reports an F-ratio with df = 3, 36 from an independent-measures study. How many treatment conditions were compared in the study?
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