Introductory statistics questions.

Consider the following data

4,9,12,10,15,16,30,4,7,2,18

From the above data, find

1. Range
2. 1^st Quartile
3. 2^nd Quartile
4. 3^rd Quartile
5. Inter-quartile range

The following statements write (T) if it is true and (F) if it is false;

1. if Mean>Medium>Mode, then the skew is positive
2. If Mean<Mediam<Mode, then the skew is negative
3. If Mean=Median=Mode, then the skew is zero.

1. What is the difference between correlation coefficient and coefficient of determination?
2. The following information obtained from data on body weight(X) and plasma volume(Y)

, ,,, ,

1. Find estimated simple linear regression model
2. Find the correlation coefficient and coefficient of determination

Write short note on the following terms

1. Probability
2. Independent events
3. Conditional probability
4. Mutually exclusive events

The following is the probability distribution of X shown in the table below.

1. Find Mean
2. Variance

Briefly define the following terms

1. Statistics
2. Statistic
3. Population
4. Parameter
5. Variable

How can you choose a sample of 30 items from 100 items using a systematic sampling?

Which of the following is not a measure of dispersion?

1. The range
2. The 50^th percentile
3. The standard deviation
4. The interquartile range

The interquatile range is used as a measure of variability to overcome what difficulty of the range?

1. The sum of the range variances is zero
2. The range is difficult to compute
3. The range is influenced too much by extreme values
4. The range is negative

If the variance of a data set is correctly computed with the formula using n-1 in the denominator, which of the following is true.

1. The data set is a sample
2. The data set is a population
3. The data set could either be a sample or a population
4. The data set is from a census