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The effectiveness of treating respiratory infections with herbal remedies was studied. "Days of fever" was used to measure effects. Among 356 children treated with herbal remedies, teh mean number of days with was 0.36, with a standard deviation of 1.59 days. Among 430 children given a placebo, the mean was 0.74, with a standard deviation of 1.23 days. Use a 0.1 significance level to test the claim that herbal remedies affect the number of days with fever. Do not assure the population standard deviation are equal. Based on these results, do herbal remedieis appear to be effective?
A). No, because the null hypothesis is rejected
B). No, because the null hypothesis is not rejected
C). Yes, because the null hypothesis is rejected
D). Yes, because the null hypothesis is not rejected
Determine the least square trend equation. Estimate the number of employees in 2008. By how much the number of employees decreases (or increases) per year on the average?
What is the probability of this project being completed earlier than 19 days?
A straight rod is formed by connecting three sections A, B and C, each of which is manufactured on a different machine. The length of section A, in inches has a normal distribution with mean 20 and variance 0.04.
During the war with Iraq in 1991 the Terraco Motor Company produced a lightweight, all terrain vehicle code named "J99 Terra" for the military. The company is now planning to sell the Terra to the public.
Calculated test statistic, decision about the null hypothesis interpretation of results, and a list of references consulted.
The sample data are summarized by the statistics n = 27, x = 4.6 years, s- 1.9 years.
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You play a game with two possible outcomes. Outcome A has probability 0.4 and outcome B has probability 0.6. When B occurs you win $2.00; otherwise, you lose $1.00. What is your expected value for this game?
Determine a 90% confidence interval estimate of the mean head circumference of all two-month-old babies.
What is the point estimate of the proportion of the population of employees who strongly dislike their current work experience (to 2 decimals)?
Give an example of a hypothesis test. State what the Null and the Alternative hypotheses.
Compare these with the percentages specified by Tchebysheff's Theorem.
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