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Medical researchers studying the effects of a low carb diet versus a normal diet randomly assigned obese patients to one of the two diets. The patients were followed up with after several months and the amount of weight lost (lbs) was recorded. Researchers advised against interpreting these results as a universal endorsement of low-carb diets for the general population wanting to lose weight. Why would the researchers give this advice? (Choose the most appropriate answer).
A. This experiment did not use blinding.
B. This experiment only used obese subjects.
C. This is an observational study so we cannot establish that the low-carb diet causes weight loss.
In order to estimate the proportion of families who prefer female baby-sitters to male baby-sitters with an error of at most 8 percentage points and with at least 95 percent confidence, how large a sample should be taken?
Primary healthcare workers believe that anaphylactic shock reaction to immunization injections occurs with children in one case in two thousand.
How accurate are radon detectors of a type sold to homeowners? To answer this question, university researchers placed 12 detectors in a chamber that exposed them to 105 picocuries per liter (pCi/l) of radon. Graph the data, and comment on skewness..
Gerstein (1965) studied the long-term pollution of Lake Michigan and its effect on the water supply for the city of Chicago. One of the measurements considered by Gerstein was the annual number of "odor periods" over the period of years 1950-1964...
Use a 0.05 significance level to test the claim that fewer than half of all teenagers in the population feel that grades are their greatest source of pressure.
The director of research and development is testing a new medicine. She wants to know if there is evidence at the 0.05 level that the medicine
If the current price of the stock is $ 26.95 what is the expected growth rate of the dividends? Give your answer to the nearest .1%.
Find the upper boundary of the 95% confidence interval for the average unload time. Round the answer to two decimal places.
Identify the basic elements of a real-estate investor's decision situation. What are the investor's objectives? Is the situation dynamic (that is, are there sequential decisions)? What are some of the uncertainties that the investor faces? What ar..
Prove that if X1 and X2 are jointly normally distributed random variables whose correlation coefficient vanishes then X1 and X2 are independent.
Twenty-six newborn baby boys are weighed and measured for length. The standard deviation of weight is 2 lb, but usual linear regression techniques
A survey result was that 54% of the sample said they get along "very well" with their parents. Using the reported margin of error, calculate a 95% confidence interval for the population proportion that gets along "very well" with their parents.
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