STAT200 Week 1 Homework Problem 1. Use meaning of Σ notation and compute Σ(X2), (ΣX)2 for the following set of numbers: 2, 3, 5

STAT200 Week 1 Homework

 

Problem 1. Use meaning of Σ notation and compute Σ(X2), (ΣX)2
for the following set of numbers: 2, 3, 5.
Problem 2.  The study was investigated how the drug affects the delay of respond to the star appeared on the screen. 100 people involved in the study were divided in four groups depending on dosage of the drug given before the test. Then delay of respond were measured for each person. Based on this description, what is the independent variable in this study?
How many levels has the study?
Problem 3.  Two studies were done to determine the income of families occupied apartments in the building.
In the study A all residences were divided in three groups depending on duration of rent: less than 5 years, 5-10 years, more than 10 years. Then, randomly 5 families were selected from each group.
In study B every fifth family were selected from the list of all residence in the building.
Identify type of sampling in study A and study B.
Problem 4.  Identify the type of data listed below as (a) quantitative discrete,
(b) quantitative continuous or (c) qualitative/nominal type:

name of the actor in a movie –
number of people in the room –
number of pages in a book –
distance –
weight –
color –
Problem 5.  Forty part-time students were asked how many courses they are taking during this term. The incomplete results are shown below:

Number of courses taken
Frequency
Relative Frequency
Cumulative Relative Frequency
1
16
0.4

2
20

3
a. Fill in blanks in the table.
b. What percent of students take exactly two courses?

c. What percent of students take one or two courses?