A random number is a number that ................? A. s selected through subject

Question

A random number is a number that ................? A. s selected through subjective sampling B. can only be found in a random number table C. is precise to six decimal places D. is uniformly distributed between 0 and 1

Confidence intervals are useful in statistics because they provide more information than a point estimate. Is T or F?

.............refers to a collection of quantitative measures and ways of describing data.? Statistical inference, Descriptive statistics, Frequency distribution, Categorical data which one is correct?

Which of the following is true of random variables?

Random variables may not have a physical or natural meaning.

Random variables are used with data that is numerical.

Each element in a sample space is represented by a random variable.

The probability of the occurrence of an event is represented by a random variable.

The probability of making a Type I error is called the level of significance of the test. Is T or F

Data are rarely used in the business environment as firms prefer using information. Is T or F

What test statistic is evaluated when testing for equality of variances? t, Z, ?2, F. which one is correct? ?

The t-Test Statistic has a t distribution with ________ degrees of freedom.  

A.

n

B.

n + 1

C.

n - 2

D.

n - 1

Random variables may not have a physical or natural meaning.

Random variables are used with data that is numerical.

Each element in a sample space is represented by a random variable.

The probability of the occurrence of an event is represented by a random variable.

Explanation / Answer

Ans:

1) is uniformly distributed between 0 and 1

2)Confidence intervals are useful in statistics because they provide more information than a point estimate.(True)

3)Descriptive statistics

4)Option C is correct.

Each element in a sample space is represented by a random variable.

5)The probability of making a Type I error is called the level of significance of the test.(True)

6)Data are rarely used in the business environment as firms prefer using information.(False)

7)For equality of variances,we use F distribution.

F=s1^2/s2^2

8)For t distribution:

df=n-1

Option D is correct.

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