MATH 227 STATISTICS FINAL EXAM - West Los Angeles College
MATH 227 STATISTICS FINAL EXAM - West Los Angeles College
MATH 227 STATISTICS FINAL EXAM - West Los Angeles College
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48. Suppose the random variable X has a normal distribution with mean 9.0 and variance 49.<br />
The probability that X takes on a value of at least 18 is approximately equal to<br />
a) .0985 b) .4015 c) .9015 d) correct approx. answer not given<br />
49. Could the population be normally distributed<br />
a. No, since the relationship between the expected z-values and the observed values is not linear.<br />
b. Yes, since the relationship between the expected z-values and the observed values is<br />
approximately linear.<br />
c. No, since the relationship between the expected z-values and the observed values is<br />
approximately linear.<br />
d. Yes, since the relationship between the expected z-values and the observed values is not linear.<br />
50. If the slope of the regression line is negative and the coefficient of determination is .64, then<br />
the correlation coefficient is<br />
a. .64<br />
b. .8<br />
c. -.64<br />
d. -.8<br />
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