Test Statistics

Methods of making decisions and drawing conclusions about population is known as

• descriptive statistics

• inferential statistics

State whether descriptive or inferential statistics has been used in the statement below.

*A recent study showed that eating garlic can lower blood pressure.

• Descriptive statistics

• Inferential statistics

State whether descriptive or inferential statistics has been used in the statement below.

*The average number of students in a class at FSKM, UiTM Tapah Campus is 30.

• Descriptive statistics

• Inferential statistics

State whether descriptive or inferential statistics has been used in the statement below.

*Eating 10 grams of fiber a day reduces the risk of heart attack by 14%.

(Source: Archives of Internal Medicine, Reader's Digest, May 2004)

• Descriptive statistics

• Inferential statistics

State whether descriptive or inferential statistics has been used in the statement below.

*Last year's total attendance at Piala Malaysia's football final games was 15,235 people.

• Inferential statistics

• Descriptive statistics

An important statistical technique that enables us to decide whether or not we will believe the claims made about populations with unknown parameters is known as

• statistics

• hypothesis testing

• experiment

• sample design

•A researcher wanted to find the effect of a special diet on systolic blood pressure. She selected a sample of seven adults and put them on this dietary program for three months. The following table gives the systolic blood pressures of these seven adults before and after the completion of the program.

The researcher is interested in determining whether the dietary program helped reduce the systolic blood pressure. Identify the statistical method that can be used to analyze the situation above.

• Independent t-test

• Paired t-test

• Regression

• ANOVA

The Head of Centre of Statistical and Decision Science Studies , UiTM Malaysia is interested to find out if the starting salaries of new statistics graduates would differ according to geographic regions of West Malaysia. To test the above claim, a survey was conducted in three regions of West Malaysia, namely the northern, southern and eastern regions. A random sample of 20 firms which hire statistics graduates is taken from each of the three regions, and the personnel manager of each firm is asked to state the starting salary for a new statistics graduate who is going to work in the statistics department of the firm.

Identify the statistical method that can be used to analyze the situation above.

• Independent t-test

• Paired t-test

• Regression

• ANOVA

An individual claims that the fuel consumption of his automobile does not depend on how fast the car is driven. To test the plausibility of his hypothesis, the car was tested at various speeds between 72 and 120 km per hour. The km per liter attained at each of these speeds were determined, with the following data resulting.

Identify the statistical method that can be used to analyze the situation above.

• Independent t-test

• Paired t-test

• Regression

• ANOVA

For the below normal distribution, which of the following option holds true ? σ1, σ2 and σ3 represent the standard deviations for curves 1, 2 and 3 respectively.

• σ1> σ2> σ3

• σ1< σ2< σ3

• σ1= σ2= σ3

• None

• Don't know