Quiz-1(SABAH)

Consider the following data 5, 3, 2, 1, 3, 13, 4, 6, 8. Find the 60% percentiles

• 5

• 4

• 6

• 8

• 3

Compute the sample standard deviation of the following sample data 2, 0, 5, 9.

• 3.9

• 2.5

• 4.2

• 5.4

• 2.3

The sum of the deviations about the mean is always:

• zero

• negative

• positive

• range

• İQR

In a negatively skewed distribution,

• the mean is larger than the median.

• the mean, median, and mode are all equal.

• the median is larger than the mean.

• the standard deviation must be larger than the mean or the median

• standard deviation and variance is equal

If die is rolled 3 times, the sample space will be...

• 36*6

• 36*2

• 12*6

• 12*2

• 36*12

The probability of A is 0.80, the probability of B is 0.10, and the probability of both (intersection) is 0.08. What is the conditional probability of B, given A?

• 0.1

• 0.8

• 0.08

• 0.64

• 0

A negative covariance value indicates ______

• a decreasing linear relationship between dependent and independent variable

• an increasing linear relationship between dependent and independent variable

• a nonlinear relationship between dependent and independent variable

• a decreasing and increasing linear relationship between dependent and independent variable

• a increasing and decreasing linear relationship between dependent and independent variable

Following is a random sample of price per piece of plywood, X, and quantity sold, Y (in thousands).

Price per Piece (x): 6, 7, 8

Thousands of Pieces Sold (y): 9, 7, 5

Compute the sample correlation coefficient.

• -1

• +1

• -0.5

• +0.5

• 0

Calculate the correlation coefficient of the following sample of four (x, y) pairs: (1, 4), (2, 9), (4, 6), and (5, 9).

• 0.518

• 0.815

• 0.581

• 0.851

• 0

A random sample of data has a mean of 90 and a variance of 25.

Use Chebyshev’s theorem to determine the percent of observations between 83 and 97.

• at least 49%

• at least 79%

• at least 99%

• at least 89%

• at least 19%