تجمع مادة الإحصاء 110 للإختبار النهائي

[hema.s]

5. "A diet high in fruits and vegetables will lower blood pressure". The branch of statistics used in thisstatement is ..................
a) Deive statistics
b) Predictive statistics
c) Inferential statistics
d) Differential statistics



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The score of students in a statistics test “, what is the type of variable ?
a) Qualitative
b) Ratio
c) Discrete
d) Continues

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3. A pharmaceutical company wants to test the effectiveness of their new drug compared to an existing drug. They divide up the subjects randomly into two groups, one group getting the new drug and one group getting the existing drug.
Use this information to answer the questions (3-4).This is an example of what type of study?
a) Outcomes study
b) Independent study
c) Observational study
d) Experimental study


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5. In a stem and leaf plot, the stem part for the data value 347 is .........
a. 34
b. 7
c. 47
d. 3

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7. When data are collected from January to December in year 2011 , then they can be represented by
a) Histogram
b) Pie graph
c) Time series
d) Pareto chart


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A store manager has found there is a relationship between the age(x),of her employees and the number of sick days(y), they take each year. If the equation of the regression line is:
y`=21.1 – 0.317x


4. For each increase of the age of the employee by one year, then the number of sick days he or she takes each year.
A) decreases by 0.317 on average.
B) increases by 0.317 on average.
C) increases by 21.1 on average.
D) decreases by 21.1 on average.


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8. The equation of the regression line between the age of a car in years(x) and its price (y); is given by: Y=65.3-9.25x. The correct statement to represent this equation is :
A) When the age of the car increases by one year the price of it decreases by (65.3) Riyals on average
B) When the price of the car increases by one Riyals the age of the car decreases by (9.25) years on average
C) When the age of the car increases by one year the price of it decreases by (9.25)
D) When the price of the car increases by one Riyals the age of the car decreases by (65.3) on average



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