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Standard Distribution and Normal Distribution
Practice:
The average heights of 250 16-year-old girls are normally distributed. The average height is 64 inches with a standard deviation of 3 inches.
What percent of girls are over 67 inches tall?
What percent of girls are between 64 and 70 inches tall?
What percent of girls are less than 55 inches tall?
How many girls are shorter than 58 inches tall?
-The weight of an average gopher is .55 lbs. with a standard deviation of .05 lbs. If the weights of 751 gophers in a sample are normally distributed...
How many gophers are heavier than .65 lbs?
How many gophers are between .5 and .6 lbs.?
How many gophers are "outliers?"
Classify the following as an example of nominal, ordinal, interval, or ratio level of measurement, and state why it represents this level: rankings of the top ten best-selling authors
Write a brief summary of the distribution of the area of homes.
Determine a 95% confidence interval for true mean cost to repair this type of car.
Suppose you are working with a data set that is normally distributed, with a mean of 300 and a standard deviation of 44. Determine the value of x from the following information.
Researcher has 100 test subjects to split into his treatment and control groups. In order to prove any causal relationship between treatment and outcome, he should:
To the nearest thousandth, find the approximate error margin for students in general (n = 13,000). (Round your answer to three decimal places.)
Research indicates that the concentration of chlorides in blood (measured in mmol/L) has a normal distribution with mean 100 and a standard deviation of 5.
a consumer magazine wants to compare the lifetimes of ballpoint pens of three different types. the magazine takes a
Muscular dystrophy is an incurable muscle-wasting disease. The most common and serious type, called DMD, is caused by a sex-linked recessive mutation.
What is the probability (in 2003) of obtaining an interview with the next household on the sample list?
A researcher wants to determine if different forms of regular exercise alter HDL levels in obese middle aged males between the ages of 35 and 45. What is the null hypothesis equation for this experiment
a study showed that 32 of all firms in county a are owned by women. you are phoning local businesses assuming that the
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