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To test the hypothesis that students who finish an exam first get better grades, a professor kept track of the order in which paper were handed in. the first 25 paper showed a mean score of 77.1 with a standard deviation of 19.6. the last 24 paper turned in showed a mean score of 69.3 with a standard deviation of 24.9. Is this a significant difference at a=.05? Perform a one tailed test.
tc=1.678
sp2=499.576
t=1.221
p-value=.1141
Perform a right tail F-test to test whether it's reasonable to assume equal variances.
State a null and alternative hypothesis.
Select a level of significance.
Identify the test statistic (assume equal variances).
Formulate a decision rule.
Make a decision.
Compute p-value and interpret.
Is it reasonable to assume equal variances?
The goal at U.S. airports handling international flights is to clear these flights within 45 minutes. Let's interpret this to mean that 95 percent of the flights are cleared in 45 minutes
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
Compare and contrast quantitative and qualitative research designs. Identify and discuss some advantages and disadvantages for each type of research.
If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
if 50,000 parts are produced, how many would you expect to fail to meet a minimum specification limit of 35lb tensile strength? How many would have a tensile strength in excess of 48lb?
Compute the standard error of estimate, and interpret its meaning.
Construct an appropriate control chart and comment on the process.
The starting salaries of individuals with an MBA degree are normally distributed with mean of $40,000 and standard deviation of $5,000. What percentage of MBA's will have starting salaries of $34,000 to $46,000?
Assume that we know from previous studies that the population mean for minutes of exercise per week for college students is Uu= 100 with a standard deviation =25
A group of children can be classified according to eye color (blue, brown, green), gender (male, female), and hobby (collecting stamps, collecting baseball cards, collecting shells, collecting stickers).
How many degrees of freedom must researcher use in her t-test critical value supposing that variances are equal?
The monthly utility bills are normally distributed with a mean value of $130 and a standard deviation of $15.
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