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A food snack manufacturer samples 9 bags of pretzels off the assembly line and weighs their contents. If the sample mean is 12.7 oz. and the sample standard deviation is 0.70 oz., find the 95% confidence interval of the true mean.
An investigator wants to estimate caffeine consumption in high school students. How many students would be required to ensure that 95% confidence interval estimate for the mean caffeine intake (measured in mg) is within 15 units of the true mean? ..
Express the null hypothesis and the alternative hypothesis in symbolic form: An entomologist writes an article in a scientific journal, which claims that fewer than 7 in ten thousand male fireflies are unable to produce light due to a genetic muta..
The 'interaction effect' was also important. By using the means in the table above write a statement explaining how the anti-anxiety drug appears to affect anxiety. Are the outcomes consistent with the hypothesis proposed by the researchers?
Library staff has reported that much of the time the study rooms are empty, despite a full booking sheet. Frame a research question and state the objectives of the study.
The following data show samples of three chain stores in three different locations in one town and the amount of dollars spent per customer per visit. At the 0.05 level, is there a difference among the means?
1 % of healthy population tested. If 0:5% of population really has disease, determine the probability that person has disease given that test result is positive.
The probability that a new advertising campaign will increase sales is assessed as being 0.60. The probability that the cost of developing the new ad campaign can be kept within the original budget allocation is 0.50.
What is the difference between calculating a confidence interval on the mean vs calculating the confidence interval on a proportion?
What is the purpose for post tests? To determine how much difference exists between the treatments.
For a given confidence interval, what is the interpretation of a 96% confidence level?
Given the data set body-weight.sav, use SPSS to calculate the 90%, 95% and 99% confidence intervals for the mean of the variable weight.
Find a 95% confidence interval for the population mean concentration of uric acid in this patients blood. What is the margin of error?
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