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FIRST SET OF QUESTIONS. MORE TO COME. 10 PER QUESTION. Hang in their
with me
#27. The 50th percentile of a distribution is the same as a distribution mean?
T or F
#26. Samples of the wires coming off the production line were tested for Tensile strength
The STatiscal results (in PSI. Were.)
Arthimeitic mean 500 Median 500
Mode 500 Standard Deviation 40
Quartile Deviation 25 Mean Deviation 32
Range 240 Number is sample 100
Q. According to the empircale rule the middle 95 percent of the wires tested between
approxiamtelty what two values?
420 and 580
#29 A row of stem and leaf charts appears as follows; 3 / 0 1 3 5 7 9 Assume that the data
is rounded to the nearest unit.
a. The frequency of the class is seven
b. The minium value of the class is 0
c. The max value of the class is 39
d. The class interval is 5
#30 The test scores of a class of 147 students are computed. What is the location of the
test scores associated with the third Quartile.
a. 111
b. 37
c. 74
d. 75%
#33. According to Chebyshev's theorem what percent of the observations lie within plus
or minus 1.75 standard devation of the mean?
a. 56%
b. 95%
c. 67%
d. Cannot compute because it depends on the shape of the disturbution
e. None of the above
#34 A sample of experience typist reveleved that their mean typing speed is 87 words per
minute and and the medium is 73. The standard deviation is 16.9 words per minute
What is Pearnson's coefficient of skewness?
a. -2.5
b. -4.2
c. +4.2
d. +2.5