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An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula. When the test is completed, the researchers determine the mean elapsed time before a cockroach was killed by each product.
I. What is the population? II. What is the sample? III. Is the study observational or experimental? Justify your answer. IV. If observational, identify ALL variables. If experimental, identify ALL independent and dependent variables. V. For each of the variables identified in part IV, list which of the four levels/scales of measurement was used to obtain data on these variables? VI. Classify each of the variables identified in part IV as either attribute or numerical.
Suppose the annual return on XYZ stock follows a normal distribution with mean 0.12 and standard deviation 0.30.
Construct a probability for the number of students in the sample who watch soap operas.
The length of country and western songs is normally distributed and has a mean of of 170 seconds with a standard deviation of 49 seconds.
A frequency polygon: does not depend on one variable. True-False
A random sample of 56 people measured accuracy w/ positive errors representing watches that are ahead of the correct time and negative rep. those behind the time.
Is there evidence that the growth hormone increases the milk production?
in studies for a medication 13 percent of patients gain weight as a side effect. suppose 514 patients are randomly
A recent national study showed that approximately 30% of college students binge-drink. Let x equal the number of students in a random sample size of n=12 who binge drink. Find the probability that
Flip the tree. Label all endpoints, supply all branch probabilities, and calculate and label an endpoint probabilities.
How did you think that your sample would compare to the national mean? This is your hypothesis. State either the alternate or null hypothesis and identify which one you are stating.
Find the 90% confidence interval for the variance and standard deviation if a sample of 15 has a standard deviation of 2.3. Assume the variable is normally distributed.
If a six appears for the third time, the turn of the player ends without moving the token. Determine the sample space of one such throw and determine the probability for each event.
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