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A study is conducted to compare mean cholesterol levels for individuals following a low carbohydrate diet for at least 6 months to individuals following a conventional (low fat low calorie) diet for at least 6 months. Test if there is a significant difference in the mean cholesterol levels between the diet programs using a 5% level of significance. Low Carb: Sample Size = 50 Mean Cholesterol = 225.4 St Dev Cholesterol = 24.5 Conventional: Sample Size = 75 Mean Cholesterol = 203.8 St Dev Cholesterol = 21.6
Population have at least some college education. choose 10 persons at random. Find the probability that at least 5 do not have any college education.
Lab technicians at a major mdical lab can process an average of 400 blood samples a day with a standard deviation of 50 samples. The processing follows a normal distribution.
you are in possession of an unusual 5-sided die. specifically the die which is not evenly weighted takes on five
Assume a steady smoker spends on average $20 with a standard deviation of $5 per week on cigarettes. What is the probability that a sample of 100 steady smokers spend between $19.50 and $21?
A poll found that 329 out of 763 adults said they would travel to outer space in their lifetime, given the chance. Estimate the true proportion of adults who would like to travel to outer space with 92% confidence.
In a study comparing individual performance with group performance
Scores ranged from 0 to 40 with higher scores reflecting greater computer anxiety. This variable was measured on the interval scale. The researcher analyzed the data using what t test?
the size of fish in a lake follows a normal distribution with mean m 1 lb 4 oz and standard deviation s 3 oz . fish
Determine if there is any diff erence between the pulse rates of smokers and nonsmokers. Compute the p-value of the test. Can you draw any conclusions?
Find the probability that number of college students who say they use credit cards because of there wards program is (a) exactly two, (b) more than two.
Suppose the true population proportion is 68%. What is the probability of observing a sample proportion 64% or smaller.
Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance, as described in each of the following:
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