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Suppose that a group of 100 consumers are asked to rate how much they liked the taste of a new soft drink on a 5-point scale (where 5 = good taste and 1 = poor taste) and the mean rating was 4.2 with a standard deviation of 1.48. Suppose, further, that the standard error of the mean for this study was 0.15. If you wanted to find the 95 percent confidence interval (two-tailed test), and if the Z-value at the.05 level of significance is 1.96, the confidence interval lies between approximately
q1. for the following questions would the following be considered significant if its probability is less than or equal
the local county is considering a budget proposal that would reallocate funding to renovate the city pools. a survey is
The results of a survey for an airline are shown below. Use the chart to find the probability that the traveler was
A 99% confidence interval for the proportion () of all Lewisburg residents whose annual income exceeds $80,000 extends from 0.10 to 0.18. what is the correct statistical decision in this case?
Undergraduates at her college and mails a questionnaire to 250 students selected at random. Only 104 questionnaires are returned. what is the population.
a sample of 220 items turned out during a given week by a certain process had average weight of 2.46 pounds and
At the 0.05 level of significance, is there evidence that the population mean amount of spending is different from $250 per trimester on textbooks
Identify the space of results of an observation of 2 consecutive minutes and identify the probability of certain line be free if in the last minute was free.
for the data set below if you were to fit a regression equation what would the value of r2 be to two decimals? hint
The mean for a sample of n=16 scores has an expected value of 50. This sample was selected from a population with a mean of µ=50.
Which are likely to be independent events? For those you think are not, suggest reasons why.
a subsample from the current population survey is taken on weekly earnings of individuals their age and their gender.
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