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Comparing tropical flowers: a contrast (optional). The data in Table 25.1 contain lengths for the bihai variety of Heliconia and for two forms (red and yellow) of the caribaea variety. We wonder (before looking at the data) whether the population mean for bihai differs from the average of the means for the two forms of caribaea.
(a) What contrast expresses this comparison?
(b) Give the null and alternative hypotheses for this comparison, find the sample contrast, and assess its statistical significance. What do you conclude?
(c) Give a 90% confidence interval for the population contrast in part (a).
Using the appropriate commands in Excel, find the value of the test statistic. Assume that σ2A = 4.4 and σ2B = 5.2 . What is the p-value
The average age in the sample was 22.5 years with a standard deviation of 5 years. Construct a 95% confidence level. What is the probability that the sample mean will be more than $306.60?
Conduct test to find out if average sales invoice this month differs from the historical data. Level of significance a = .05
The speed with which utility companies can resolve problems is very important. GTC, the Georgetown Telephone Company, reports they can resolve customer problems the same day they are reported in 70 percent of the cases.
Draw a histogram of this data. Be sure to give labeled scales. Use the given table and/or the histogram to answer the following questions:
Assuming that there is no cost to enter the .sweepstakes, find the expected value of the amount won for one entry. Round to the nearest tenth.
Organise the data in appropriate class intervals and draw a histogram of the frequency distribution and find the Mean, Median, Range, Standard Deviation and Coefficient of Variation of the yield for the top 40 Australian companies.
The mean, median, and mode are the most common measures of dispersion (spread).
1.experiments on learning in animals sometimes measure how long a laboratory rat takes to find its way through a maze.
questiona jonka tries to connect to his internet service provider. the probability that he connects on any single
the mean amount of gasoline and services charged by key refining company credit customers is 74 per month. the
For a hypothesis test about a population proportion or mean, if the level of significance is less than the p-value, the null hypothesis is rejected.
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