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1) Distribution of scores on SAT is approximately normal with the mean of 500 and the standard deviation of σ = 100. For population of students who have taken SAT.
a) What percentage has SAT scores greater than 550?
b) What is the minimum SAT score required to be in the highest 10% of population?
c) If state college only accepts students from top 60% of the SAT distribution, determine the minimum SAT score required to be accepted?
2) For a sample with standard deviation of 10, a score of X = 44 corresponds to z-score of 0.50. Based on this info, determine the sample mean?
3) Which of the given exam scores must lead to better grade? Describe your answer.
a) A score of X = 55 on an exam which has a mean of 60 and standard deviation of 5.
b) A score of X = 40 on an exam which has a mean of 50 and standard deviation of 20.
The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution with a mean of 516 hours and a standard deviation of 20 hours. The proportion of batteries with lifetimes exceeding 520 hours is approximately.
Answer all of these questions using R Commander. Include all graphs, outputs from R Commander.
Multiple comparison procedures are going to be done using the Bonferroni method with α = 0.10. The value of t** is 2.2426. The smallest minimum significant difference (MSD) for finding a difference between groups is computed as 17.68. The correct ..
Which of the following would produce a new confidence interval with smaller width based on these same data and produce a new confidence interval
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
They were planted in four different locations, so we will consider the field as a second factor because different soil and moisture types can also have an effect on yield. The interaction plot below was obtained.
Suppose that an IQ test was given to a large group of persons, the scores are assumed to be from a normally distributed population, that mean = 100 and s (standard deviation) = 15.
Prepare a power curve for this decision rule
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Find the critical F value for the Following,
Solve linear program graphically
In a binomial distribution n = 8 and π = 0.2. Determine the probabilities of the following events.
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