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A student group claims that first-year students at a university should study 2.5 hours (150 minutes) per night during the school week. A skeptic suspects that they study less than that on the average. A survey of 51 randomly selected students finds that on average students study 138 minutes per night with a standard deviation of 32 minutes. What conclusion can be made from this data?
Assume gasoline prices for a region are normally distributed. Do the data you obtained provide enough evidence to reject the claim?
Could the interval be used to estimate the mean amount of time a 9-year-old American spends eating & drinking each day. Explain.
How can you tell when you should use the ANOVA versus a t-test? What is one problem with using the ANOVA when the t-test is the appropriate data analysis?
The booster club has gotten several businesses and car dealers to donate gasoline and cars for the college students to use to make a maximum of 575 personal contacts daily during the fund-raising drive. The college student will donate a total of 2..
The average hourly wage last year for members of the hospital clerical staff in a large city was $6.32. The standard deviation of the population was $.54. This year a sample of 50 workers had an average hourly wage of $6.51. Test the claim at alph..
Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades? Explain.
Airplaneflight during the last year. If we take a random sample of 40 adults, the probability is 0.37 that the sample proportion is greater than what number.
What is the sensitivity and specificity of the test? Suppose that 1 out of 500 infants are born with Down's syndrome.
Test either there is any difference among the given variable also what does the Levene's Test shows. What variable is presented in this table.
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval
Steven collected data from 20 college students on their emotional responses to classical music. Students listened to two 30-second segments from "The Collection from the Best of Classical Music."
At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
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