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A pysics lab instructor wants to estimate the time required for physic students to complete a required experiment. From a previous study she found the population standard deviation to be 16 mins. How large a sample is required to be 90% confident that the point estimate is within 5 min of the population mean time?
Pollsters try to determine whether or not a person is a "likely voter" before they count their opinion in a poll. If we assume 40% of the registered voters will actually vote, in a random sample of 100 registered voters we can be 95% confident tha..
Discuss which analysis of variance should be applied when an experiment has more than one independent variable. Discuss the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc tests..
Thirty randomly selected students took the calculus final. If the sample mean was 79 and the standard deviation was 8.5, construct a 99% confidence interval for the mean score of all students.
Findout the consumption level separating the bottom 45% to the top 55%. The September energy consumption levels for single family homes are found to the normally distributed with a mean
Find the z-score for a car driving 20 mph in this construction zone. It is an outlier (assume the data is bell shaped, so dont actually test it with pearsons index).
the following are body mass index bmi scores measured in 12 patients who are free of diabetes and participating in a
A random sample of n = 4 scores is chosen from the population with µ = 80 and σ = 20. On average, how much difference would you expect between sample mean and population mean?
car rental rates per day for a sample of seven eastern u.s. cities are as follows the wall street journal january 16
Can the researcher conclude that humidity has a significant effect on eating behavior? Use a two-tail test with α = .05.
a sample of 81 account balance of a credit company showed and average balance of 1200 with a standard deviation of 126.
A study of elephants is conducted to determine the average weight of a certain subspecies of elephants. The standard deviation for the population is 500 pounds.
Suppose we want to conduct a poll to estimate the proportion of voters who approve of the current mayor, and we plan to use a 95% confidence interval for our estimate.
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