58. The current mean price of gasoline in Los Angeles is$3.93 per gallon with a standard deviation of 15 cents.Please assume that gas prices are “normally distributed” for the purposes of this question.Costco is sellingtheir gas for$3.67 per gallon.What is this price in standard units?Assuming the Empirical Rule applies,would this price be unusual or not? Round to the nearest hundredth.(a) z = 1.73 ; This price would not be unusual(b) z = -1.73 ; This price would not be unusual.(c) z = 1.73 ; This price would be unusual.(d) z = -1.73 ; This price would be unusual.

Statistics 10Vivian Lew

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Statistics 10Review Materials for Exam 14/23/2014 8am-8:50am59. The average cotton production by counties in the Confederate states in 1860 was approximately 6,000 baleswith a standard deviation of 12,000 bales. If each bale of cotton cost$55 in 1860, what can we say about themean and standard deviation of the value (worth in dollars) of cotton in 1860 for the counties of the ConfederateStates?

The following variables were collected from a group of individuals who answered a survey:60. Weight (in pounds)(A) Numerical(B) Categorical61. Seat Number on an Airplane(A) Numerical(B) Categorical62. Beverage preference

63. For two numerical variables X and Y, as the relationship deteriorates from a perfect linear correlation, whathappens to the points on a scatter diagram?

64. If two numerical variables X and Y have a correlation coefficient of .70, what percentage of one variable can beaccounted for by the other variable?A) 30%B) 49%C) 51%D) 70%E) The answer will depend on which one you designate as the Y variable.

Statistics 10Vivian Lew

Statistics 10Review Materials for Exam 14/23/2014 8am-8:50am65. Which one of the following best describes the relationship between the correlation and slope?