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300 randomly selected television viewers were questioned on the main reason they watched particular programs. The results are given below.
"Relieve Boredom" "Get some Laughs" "Learn Something" Total
Male 65 70 25 160
Female 45 50 45 140
Total 110 120 70 300
a. State the null and alternative hypotheses for a contingency table test for independence of gender.
b. State the decision rule, using a .05 level of significance.
c. Calculate the χ2 test statistic for this data.
d. Give your conclusion for this test.
Assume that a 95% confidence interval estimate of the population mean annual starting salary is required. What is the planning value for the population standard deviation?
Test an appropriate hypothesis and state your conclusion. Be sure the appropriate assumptions and conditions are satisfied before you proceed.
Fruit Flies. Researchers tracked a population of 1,203,646 fruit flies, counting how many died each day for 171 days. Here are three time plots offering.
Compare the results for this exercise with those that you found in the previous exercise. What is the effect of multiplying the sample sizes by 4?
This means that you may refer to your textbook, notes, and online course materials, but you must work independently and may not consult anyone.
The probability of an offender having a speeding ticket is 35%, having a parking ticket is 44%, having both is 12%. What is the probability of an offender having either a speeding ticket or a parking ticket or both?
Compute the median and store it in the R variable val. Repeat this process 5000 times. You can use the R command for(i in 1:5000) val[i]=median(rbinom(20,6, 0.9)).
Can we conclude that wrapping foods in familiar packaging increased the number of bites that children took compared to plain packaging?
Suppose we have a population with the mean of 100 and a standard deviation of 28.We take repeated samples of size 49 and calculate the mean of each sample to form a sampling distribution. Find the mean and standard deviation of the sampling distrib..
To determine the effect of advertising in the Yellow Pages, Bell Telephone took a sample of 40 retail stores that did not advertise in the Yellow Pages last year but did so this year. The annual sales (in thousands of dollars) for each store in bo..
Derive an expres- sion (involving p) for the probability that exactly one tag is lost given that at most one is lost ( Ear Tag Loss in Red Foxes, J. Wildlife Manag., 1976: 164-167). (Hint: Draw a tree diagram in which the two initial branches refe..
Question one: How are cumulative frequencies and percentiles different? How are they the same?
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