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Vitamins in bread. Does bread lose its vitamins when stored? Here are data on the vitamin C content (milligrams per 100 grams of flour) in bread baked from the same recipe and stored for 1, 3, 5, or 7 days. The 10 observations are from 10 different loaves of bread.
The loss of vitamin C over time is clear, but with only 2 loaves of bread for each storage time we wonder if the differences among the groups are significant.
(a) Use the Kruskal-Wallis test to assess significance and then write a brief summary of what the data show.
(b) Because there are only 2 observations per group, we suspect that the common chi-square approximation to the distribution of the Kruskal-Wallis statistic may not be accurate. The exact P-value (from the SAS software) is P = 0.0011. Compare this with your P-value from part (a). Is the difference large enough to affect your conclusion?
assume that the readings at freezing on a batch of thermometers are normally distributed with mean 0degc and standard
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Risks and Odds in Everyday Life, James Burke claims that about 70 percent of all single men would welcome a woman taking the initiative in asking for a date. A random sample of 20 single men was asked if they would welcome a woman taking the initiati..
Explain how the Central Limit Theorem can help you convince your boss that while you can't get rid of sampling error the results from your statistical work (that is based on sampling) can still be useful.
Using the template below, sketch the results of a sensitivity analysis on P(Deal Succeeds) for a risk-neutral decision maker. How high does P(Deal Succeeds) have to before before the decision maker could engage in the business deal?
What are the three criticisms of null hypothesis statistical testing?
If x has infinitely many ancestors, then how is h(x ) chosen according to the proof of the equivalence theorem (1.4.1)?
Montarello and Martens (2005) found that fifth-grade students completed more mathematics problems correctly when simple problems were mixed in with their regular math assignments.
A lending institution supplied the following data on loan approvals by four loan officers. Conduct an appropriate Hypothesis test to determine whether the loan approval decision is independent of the loan officer reviewing the loan application.
Security B has an expected return of 12 percent, a standard deviation of returns of 10 percent, a correlation with the market of 0.7 and a beta coefficient of 1.0.
Use differential to approximate square root of 16.3
The following table summarizes the grades for ten group projects that were completed by two different groups of high school students. Which group of students exhibits the least degree of central tendency about the mean value for their project gra..
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