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Use the given information to find the minimum sample size required to estimate an unknown population mean. How many adults must be randomly selected to estimate the mean FICO score of working adults in a country? We want 90% confidence that the sample mean is within 4 points of the population mean, and the population standard deviation is 61. What is the minimum sample size required?
a meteorologist claims that the average of the highest temperature in the united states is 98 degrees. a random sample
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval? What percentage of times will the mean, or population proportion, not be found within the confidence ..
question a researcher is interested in comparing tastiness of different kinds of cheese in grilled cheese sandwiches.
Using the data file below, construct a histogram and a frequency polygon. Describe the shape of this distribution.
Why are quasi-experimental designs used more often than experimental designs?
which of the following statements regarding a negative correlation is true?a. high values of the x variable tend to be
The answer was finding the length and width of a rectangle. The results were x= 3 and x= -4. Neither the length or width can be a negative number. However, 3 did work in the original equation."
a populations distribution is normal with a mean of 20 and a standard deviation of 5. a sample of 16 observations is
When no natural gas is present the test is accurate 90% of the time. Find the best set of decision for the landowner to maximize her profit.
A study was conducted to estimate the mean amount spent on birthday gifts for a typical family having two children. A sample of 195 was taken, and the mean amount spent was $210.97.
At a .10 level of significance, use Stat Tools (or Excel) to test the sponsors' hypothesis. State the null and the alternative hypotheses and the decision rule. Finally, discuss your findings.
for liquid metals with a prandtl number much less than unity the velocity profile inside the thermal boundary layer on
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