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1. Ten years ago a study at a large midwestern university found that 18% of the students at the university were very optimistic about their prospects of finding a satisfying job after graduation. To determine if opinions have changed, an SRS of 100 students currently enrolled at the university was selected. 25% of those selected were optimistic about their prospects of finding a satisfying job after graduation. Let p be the proportion of the current student population that is optimistic about their prospects of finding a satisfying job after graduation. The P-value of a test of H0: p = 0.18, Ha: p 0.18 is
A. less than 0.05.B. between 0.05 and 0.10.C. greater than 0.10.
2. The 200 students in a statistics class were randomly divided into two groups of 100 students. Both groups were given the same midterm exam at the same time. One group took the exam in a classroom in which the air temperature was normal (68°). The other group was given the exam in a similar room in which the air temperature was unusually warm (84°). Both groups had one hour to complete the exam. Seventy-four of those taking the exam in the normal room passed, while only 66 of those taking the exam in the warm room passed. Let p1and p2 represent the probability of passing under normal and warm conditions, respectively. To determine if this is evidence that students perform worse under uncomfortable conditions, you test H0: p1 = p2, Ha: p1 > p2. The P-value of this test is
A. 0.1093.B. 0.0547.C. Both choices are correct.
3. We want to see if a panel of 30 expert wine testers can distinguish between a 1990 and 1991 Chardonnay. We present them each with three glasses of wine. The three glasses are either two glasses of the 1990 and one glass of the 1991 in a random order, or two glasses of the 1991 and one glass of the 1990 in a random order. The experts are supposed to identify which of the three glasses contains a different wine. If each of the 30 experts is just guessing and X is the number that guess correctly, then the sample proportion = X /30 who guess correctly has
Consider the following stemplot. The mean of the data represented in this stemplot ?
The 50 members of the placebo group had blood pressure lowered by an average of 15 points with standard deviation 8 points. To analyze this information we will use a, When testing whether or not the increases in spending are different, the test is ..
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
The conservative degrees of freedom for the t distribution are and The standard error, conservative degrees of freedom
Draw two pie charts, which allow the total yearly exports to be compared. Explain the trend in the export of fish as shown in the two pie charts.
The standard deviation of the time to complete the entire homework assignment
What is the city mileage standard deviation for this SUV model?
Compute the variance and standard deviation
If a blue ball is selected you win nothing. Let X be the amount that you win. The expected value of X and let the random variable X be a random number with the uniform density curve given below
Solve the equations using linear algebra
Plan the scatter diagram
Conduct a marketing experiment in which students are to taste one of two different brands of soft drink
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