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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?
The daily revenue totals for the next 30 days will be monitored. What is the probability that the mean daily revenue for the next 30 days will be between $7000 and $7500?
ComputerWare asked 500 of its iMac purchasers what computer they owned or had owned. There were 83 new computer owners, 60 who had owned a Windows-based computer, and 357 who had owned a Macintosh.
The singer has the following variety of songs, in no particular order: 7 relationship songs, 6 songs about people, 4 reflective songs, and 4 songs about places.
Summarize the NSC concentrations graphically and numerically for each type of forest. How do dry forests compare to moist forests in terms of NSC concentrations?
Is the probability that buyer 2 wins the auction equal to 1?- Compute the seller's expected revenue if the buyers implement the strategies (β1, β2).
On average, how long must customers wait in line before service begins?
provide a detail explanation for every case1. there are 6 types of rolls available in a bakery in quantities of dozens
What is the probability that the mean value of the homes owned by those invited to her meeting will be greater than $200,000?
In an article entitled "Fuel Economy Calculations to Be Altered," James R. Healey indicated that the government planned to change how it calculates fuel economy for new cars and trucks.
a web based software company is interested in estimating the proportion of individuals who use the firefox browser. in
the scores on a hypothetical vocabulary test of a group of 20 year olds and a group of 60 year olds are shown below20
What is the expected value of the probability distribution? What is the variance of the probability distribution?
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