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Conduct a one-tailed hypothesis test given the information below.
A manufacturer wants to increase the shelf life of a line of cake mixes. Past records indicate that the average shelf life of the mix is 116 days. After a revised mix has been developed, a sample of nine boxes of cake mix had a mean of 117.333 and a standard deviation of 2.456. At the 0.05 significance level, what is the critical value? State the null and alternative hypothesis. Draw a diagram. Provide the computation of the test statistic. State your decision in terms of the null hypothesis.
the weights in pounds of discarded plastic from a sample of households summary statistics are n62 x1.911 s1.065 use a
At the .10 significance level you will test to determine if there has been an increase in selling time. Is this a 1 or 2 tail test?
A sample of 120 observations revealed that p = .30. At the .05 significance level, can the null hypothesis be rejected?
Construct three scatter plots for: (1) percentage alcohol versus calories, (2) percentage alcohol verses carbobydrates, and (3) calories versus carbohydrates
many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. one way
Given are the numbers of times the machine was used over each of the last 30 days. Find out the mean number of times the machine was used per day.
A neuropsychologist compare the auditory abilities of blind versus normally sighted rats. He predicted that the visually impaired rats would have better auditory development than normally sighted rats.
Construct a 95% confidence interval estimate for the population proportion of administrative professionals who prefer cash bonuses.
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 20 hours, with a standard deviation of 5.5 hours
a nursing school wants to estimate the true mean annual income of its alumni. it randomly samples 120 of its alumni.
the traditional view about the normal curve in psychology is that normal curves are 6a rare in nature but often occur
The article claims that the distributions of annual returns for both common stocks and long-term government bonds are bell-shaped and approximately symmetric. Assume that these distributions are distributed as normal random variables with the mea..
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