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The following data give the mean of SAT Mathematics scores by state for 1999 for a randomly selected 20 states (source: The World Almanac and Book of Facts 2000).
558
503
565
572
546
517
542
605
493
499
568
553
510
525
595
502
526
475
506
(a) Construct a stem-and-leaf display and interpret.
(b) Construct a frequency histogram and interpret.
(c) Construct a pie chart and interpret.
weight status category and the corresponding percentiles and bmi ranges for 10-year-old boys in the states table.weight
Compute a 95% confidence level for the difference in the means of the two treatment methods and select the best answer below. Assume that the independent random samples were taken from normal distribution.
you are choosing among three investment plans. the payoffs of these investment plans depends on next years gdp see the
A manufacturer claims that the life span of its tires is 52,000 miles. You work for a consumer protection agency and you are testing these tires. Assume the life spans of the tires are normally distributed.
suppose we are testing the null hypothesis ho20 and the alternative ha does not 20 for a normal population with a
A journal polled its readers to determine the proportion of wives who, if given a second chance, would marry their husband again.
Studies of ‘‘intellectually gifted'' children have generally defined the lower limit of their IQ scores at 140; approximately 1% of the population have IQ scores above this limit. Find the standard deviation of this distribution.
A random sample of 90 printers discovered that 25 of them were being used in small businesses. Find the 95% limit for the population proportion of printers that are used in small buisnesses.
given a total study size of n and comping g levels of the explanatory factor the numerator degrees of freedom and the
Determine and report the within-group slope which relates Y to Xc (for this, you will have to look at your regression printout).
hand-calculate the sample size that will be required to detect an increase or decrease of 1.5sigma from the mean of one
a construction company employs two sales engineers. engineer 1 does the work of estimating cost for 70 of jobs bid by
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