A set of 11 data values has a mean of 8 and a standard deviation of 2. At least

Question

A set of 11 data values has a mean of 8 and a standard deviation of 2. At least one of the data items is the value 8 . if this single data value is removed without replacement form the data set. the std deviation of the remaining data Stays the same Decreases Increases Not enough information is given for comparing on-time delivery reliability of two suppliers, the most suitable distribution is Normal Chi-square Poisson F distribution The values for x^2 left and x^2 right for a 98% confidence interval when n = 12 are: 3.571 and 26.217 3.053 and 24.725 2.603 and 24.705 3.053 and 26.217 The standard error of the estimate is a measure of Total variation of the Y (dependent) variable The variation around the regression line Explained variation The variation of the X (independent) variable The z value corresponding to a 96.6% confidence interval is. 2.12 188 3% 197 Given a data set with 23 yearly observations, there are______four-day moving ave rages. 22 25 20 21 If two different brands of paint were tested to see which one dries faster, this would be A test between two variances A test between two means A test between two proportions a test between two standard deviations

Explanation / Answer

Q1 - C - increases

Q2 - D - F-distribution

Q3 - A - 3.571 and 26.217 (refer the values from chi-square tables ) for df = 12, and column .99

Q4 - B - variation around the regression line

Q5 - B - 1.82 refer standard normal table for the corresponding z for 96.6% confidence level

Q6 - C - 20

Old Data New Data N 11 N 10 mean () 8 mean () 8 SD () 2 SD () 2.097618 (x-µ)2 = 2*N item removed, x' = 8 = 44 x'- = 0 So, (x-µ)2 = 44

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