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John Beale of Stanford, CA, recorded the speeds of cars driving past his house, where the speed limit read 20 mph. The mean of 100 readings was 23.84 mph, with a standard deviation of 3.56 mph. (He actually recorded every car for a two-month period. These are 100 representative readings.)
a) How many standard deviations from the mean would a car going under the speed limit be?
b) Which would be more unusual, a car traveling 34 mph or one going 10 mph?
Suppose a social worker is involved in a study about family structure. She obtains information regarding the number of children per family in a certain community from the census data. What is the random variable of interest? Is the random variable..
steve and his friends are relaxing at a local tavern. the number of drinks that steves table receives is poisson
Manufacturer of guitar amplifiers markets one of its models,
assume that in a population of interest the ratio of males to females is 11. if you choose a random sample of 25 from
Individual A has a circle of ve close friends (B, C, D, E, and F). A has heard a certain rumor from out- side the circle and has invited the ve friends to a party to circulate the rumor. To begin, A selects one of the ve at random and tells the r..
A sample of 15 female collegiate golfers was selected and the clubhead velocity (km/hr) while swinging a driver was determined for each one, resulting in the following data ("Hip Rotational Velocities During the Full Golf Swing," J. of Sports Sci..
what is wrong with this statement? high linear correlation proves that the explanatory variable variable x caused the
A company needs to increase its production beyond its existing capacity. It has narrowed the alternatives to two approaches to increase the production capacity: (a) expansion, at a cost of $ 8 million, or (b) modernization at a cost of $ 5 million. B..
do males and females differ in the amounts they spend on valentines day? the average expenditure in a sample of 40 male
The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart.
it is known that the white shark grows to a mean length of 22 feet however one marine biologist believes that great
he next 20%, a B; the next 40%, a C; the next 21%, a D; and the bottom 10%, an F. What average must you exceed to receive a grade of C or better?
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