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1. The amounts (in ounces) of juice in eight randomly selected juice bottles are:
15.4 15.7 15.2 15.8 15.8 15.4 15.0 15.6
Assuming the population of amounts in juice bottles is known to be normally distributed, create a 95% confidence interval estimate for , the mean amount of juice in all bottles.
You will be asked to identify x-bar, s, , df, t, E and the confidence interval.
2. Previous studies have indicated the standard deviation of annual earnings for college students is $850. How large a sample would need to be taken to estimate the mean for college students' annual earnings to within $200 with 99% confidence?
3. A researcher is interested in estimating the proportion of voters who favor a tax on e-commerce. How large a sample would she need to collect to estimate this proportion to within 5% with 95% accuracy?
To find z-score and required probabilities based on Normal distribution. Assume that childrens weekly allowances are normally distributed in the population.
The standard screening test for Down's syndrome is based on a combination of maternal age and the level of serum alpha fetoprotein. Using the test 80% of Down's syndrome cases can be identified while 5% of normals are detected as positives.
In grading eggs into small, medium and large, Margi farms packs the eggs that weigh more than 4.25 ounces in packages marked " large" and the eggs that weigh less than 2.45 ounces in packages marked " small" the remainder are packed in packages ma..
Fast Service Truck Lines uses the Ford Super Duty F-750 exclusively. Management made a study of the maintenance costs and determined the number of miles traveled during the year followed the normal distribution. The mean of the distribution was 60..
Use frequency distribution to create a probability distribution, determine the (b) mean,(c) variance and (d) standard deviation of probability distribution and (e) interpret results in context of real life situation.
Why do we have so many several measures of central tendency? Are all really essential or do they essentially give same information?
A company is producing cylindrical blocks for a children's toy. The average diameter of a block is 3.5 inches. Sixteen blocks are inspected and the diameters are measured.
One state lottery has 1000 prizes of $1, 200 prizes of $5, 50 prizes of $25, 15 prizes of $150, 4 prizes of $500, and 1 prize of $2500. What is the lottery expected profit per ticket?
A typical problem statement is correlation research is _____________
How many departments would they need to survey to achieve this level of accuracy with 95% confidence?
By using the age midpoints x and the percentages of nurses, do we have a valid probability distribution? Describe.
40 were in favor of the Independent candidate, and 140 were undecided. At a 1% level of significance, test to see if the proportion of voters has changed. Calculate the value of the Chi-Square Test Statistic for this problem. What is it?
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