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The weights of professional baseball players follow a normal distribution with a mean of 200 pounds and a standard deviation of 25 pounds. Find the probability that a randomly selected professional baseball player has a weight less than 225 pounds, P(x < 225) - ? Hint: Convert 225 to z-value and use Appendix Table II or Excel function NORMDIST(x, ?, ?, 1). '
A. 0.8413
B. 0.6915
C. 0.1378
D. 0.0195
a list of 50 subjects is entered into a computer file and then sorted by last name. the subjects are assigned to five
The probability of a failure during the warranty period is 5%.if 90% of the connector are kept dry and 10% are wet, What proportion of connectors fail during the warranty period?
Q. An owner of a chain of stores would like to predict weekly sales based on the number of customers who made a purchase. A random sample of 10 stores were selected. The weekly sales are in thousands of dollars.
A researcher demonstrated a correlation of r = 0.60 between teacher attire and student academic performance across 150 grade schools in her state.
a seven-year medical research study reported that women whose mothers took the drug diethylstilbestrol des during
Jim Sears manufactures farm equipment. His work requires the use of steel bars which must have a mean length of at least 50 inches. The bars can be purchased from a supplier in Kansas
question assume the branch manager requested estimates of the mean selling price of gulf view condominiums with a
in a random sample of males 23 write with their left hand and 217 do not. 65 females write with their left hand and 455
A survey of college students collected information on several variables: Distance from Home, Age, Major, Gender, and Class. The variable Major is
1.in the 2004 presidential election early exit polls conducted at key precincts indicated a strong lead for john kerry.
Smoking on campus. suppose 20% of the students on campus smoke. you select two students at random. In what percentage of samples will both students be smokers?
run a regression of the dependent variable on the continous and categorical independent variables. what conclusion can
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