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The IQ scores for a sample of 24 students who are entering their first year of college are:
115 119 119 134
121 128 128 152
97 108 98 130
108 110 111 122
106 142 143 140
141 151 125 126
a. Find the mean IQ score.
b. Find the median IQ score.
c. Find the modal IQ score.
d. Find the range.
e. Find the standard deviation.
Draw a frequency polygon for these data (start by defining intervals of the data and counting the data points in each interval).
Suppose the weight of a product is normally distributed with a mean of 1.5 and a variance of 0.2. What percentage of products will have weights within +/- 3 standard deviations? Critically discuss the lower and upper limits bounding 50% of product we..
The urinary fluoride concentration (parts per million) was measured both for a sample of livestock grazing in an area previously exposed to fluoride pollution and for a similar sample grazing in an unpolluted region
Given what we have learned through the literature review, our hypotheses are:
Use a 0.05 significance level to test the claim that fewer than half of all teenagers in the population feel that grades are their greatest source of pressure.
a random sample of 100 adults was selected. 80 adults in the sample said they were non-smokers1. what conditions must
test scores for a statistics class had a mean of 79 with a standard deviation of 4.5. test scores for a calculus class
HI6007-Statistics and Research Methods for Business Decision Making-Holmes Institute-Australia- Determine the coefficient of determination R2 and interpret it.
Within 3% and using 90% confidence, with no estimate for the population proportion, how large should our sample be?
Black Hole Pizza Parlor instructs its cooks to put a "handful" of cheese on each large pizza. A random sample of six such handfuls were weighed.
Car rental Thrift rents a compact car for $33 per day, and General rents a similar car for $20 per day plus an initial fee of $78.
A random sample of 51 observations was selected from a normally distributed population. The sample mean was = 88.6, and the sample variance was s2 = 38.2.
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