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Sihir Perempuan Penyihir
Ikut Turutan
Universiti
matematik

AM025 TOPIC 8 (A17)

Shirley Hee
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0
Masalah tambahan (11/ 20)
Allow incorrect answer
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masalah 1

pilihan

What does the correlation coefficient measure?

  • The differences between two variables.
  • The strength and direction of a linear relationship between two variables.
  • The mean of a dataset.
  • The probability of an event occuring.

masalah 2

pilihan

If the correlation coefficient between x and y is zero, what can be concluded?

  • There is no linear relationship between x and y.
  • x causes changes in y.
  • x and y are positively correlated.
  • x and y are negatively correlated.

masalah 3

pilihan

What is the Pearson’s correlation coefficient when there is perfect negative relationship between two variables?

  • 0
  • 1
  • -1
  • ∞\infty

masalah 4

pilihan

What is the primary purpose of linear regression analysis?

  • To calculate the mean of a variable.
  • To determine the relationship between two variables.
  • To compare differences between two variables.
  • To analyse data distribution.

masalah 5

pilihan

In the equation y^=a+bx\hat{y}=a+bx, what does bb represent?

  • Constant
  • Independent variable
  • Slope (Regression coefficient)
  • Residual

masalah 6

jawapan pendek

The table shows the result of an investigation to 8 employees of different ages. The employees are given 100 questions related to the importance of integrity. Find the coefficient of correlation.

  • r=0.9056

  • 0.9056

masalah 7

jawapan pendek

The table shows the result of an investigation to 8 employees of different ages. The employees are given 100 questions related to the importance of integrity. Obtain the equation of linear regression.

  • y=37.285+0.772x

petunjuk

Regression coefficient must be in 3 decimal places.

masalah 8

jawapan pendek

The following statistics shows the advertising expenses, X (RM’000) and sales revenues, Y(RM’000) of 15 company. Σx=423,Σx2=24479,Σy=987,Σy2=75490,Σxy=37630\Sigma x=423,\Sigma x^2=24479,\Sigma y=987,\Sigma y^2=75490,\Sigma xy=37630 Find r2r^2

  • 0.7252

masalah 9

jawapan pendek

The time spent in the gym fitness centre (minutes) and the weight in kilograms(kg) of seven randomly selected women are given in the table. Estimate the weight of a woman who spent 40 minutes in gym.

  • 64.3kg

  • 64.3 kg

petunjuk

Leave your answer in 1 decimal places

masalah 10

jawapan pendek

A salesman is studying the relationship between age(x) and the price(y) of a model of hand phone. The data obtained is shown in the table. Predict the price of hand phone at age 10 months.

  • RM1236.50

  • RM1236.79

petunjuk

Example: RM1111.11

masalah 11

jawapan pendek

The table shows the number of hours spent on sleep daily and the weight of body (in kg) of six boy students. Estimate the body weight of a student who spent 6.5 hours daily for sleep.

  • 84kg

  • 84 kg

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