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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.
what percent of the total number of seeds germinated?
how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%, I want to know if the results are significant at = 10%. With the information given.
Assuming the population is large, which sample size will give the smallest standard deviation to the statistic and select the numbers for the first five to be interviewed.
Suppose we wish to test the null hypothesis that there are no differences among the proportion of men and women who developed a rash. Evaluate the P-value of the chi-square test of this hypothesis.
They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors.
each person received was determined by randomization. For each person who was sent one of the surveys, the researcher recorded whether or not a completed survey was returned.
According to a recent survey, 275 of 400 middle-aged Americans said they used the Internet regularly. 140 of 400 senior citizens said they used the Internet regularly.
Would you expect the mean absolute percentage error to be more than or less than 0.25? Describe.
In a distribution of scores, the arithmetic mean is 51, the median is 55, and the mode is 62. What is the score, in percentile form, of a subject who does less well than two-thirds of the sample?
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.
For the data shown below, prepare a x-bar chart. Note that the sample size is three. Record the values for the UCL, center line, and LCL. In addition, note any points that are out of control.
The alternative hypothesis is true. In this case the consumer advocacy group will have, A consumer advocacy group doubts this claim and tests the hypotheses
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