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Suppose that 14 individuals take a two-day course that is supposed to improve their knowledge of Web page design, which is rated as "not proficient," "proficient," or "advanced proficient." Of the 14 individuals in the sample, 12 are rated higher after the course than before, 1 individual is rated lower, and 1 individual's assessment is unchanged. Using a significance level of 0.05, can we conclude from this information that the course is successful in improving individuals' knowledge of Web page design?
P-value to test hypotheses,
Is global F ratio significant? Identify this F ratio, and describe whether it is important.Is coefficient for X1 (productivity) significant? How do you know? Mention its t value and accompanying P-value.
What is the null hypothesis? Use a = 0.05 .
In a study of the consumer's view of the economy, the probability that a consumer would buy a house during the year was 0.0013, and the probability that the consumer would buy a car during the year was 0.198. There was also a 0.0100 probability t..
Describe the Linear programming problem with constraints. Which among the following is not acceptable as a constraint in a linear programming problem?
A market research company surveyed consumers to determine their ranked preferences of energy drinks among the brands Monster, Red Bull, and Rockstar.
Do the data indicate that the sleeping pill is effective at a 1% level of significance?
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Is the sample size large enough to construct a valid confidence interval for the proportion of debit cardholders who have used their card in making purchases over the Internet?
Findout the margin of error for this survey if we want a 99 percent confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
What is the probability that none can transact business in a foreign language?
Is there a difference in the extent of wound healing by treatment? (Hint: Are treatment and the percent wound healing independent?) Run the appropriate test at a 5% level of significance.
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