Book page 5-10

14 important questions on Book page 5-10

Z score/ standard score

Tell us the distance of an x-score from the sample mean, in unit free terms

What are the two steps for score location?

1. We compute a z score that corresponds to the original x score
2. We use a table of areas for the standard normal distribution to look up the % of scores that fall below that z score

How does a normal distribution/ Gaussian distribution appears in a histogram?

Bell-shaped
  • Higher grades + faster learning
  • Never study anything twice
  • 100% sure, 100% understanding
Discover Study Smart

What do we obtain when we convert an x score into a z score?

An index of distance from that mean that is not related to the original units of measurement

When are values far or very far from the mean?

Far= below z=-2.00 or above z=2.00
Very far= below z=-3.00 and above z=3.00

In what three areas can normal distribution be divided?

1. 2.5% of the area below -z, the ''lower tail''
2. 95% of the area in the centre
3. 2.5% of the area above +z, the ''upper tail''

What does an empirical example illustrates?

The way the dispersion or variation of the sampling distribution changes as N is increased

When do hypothesis correspond to equations?

For statistical significance tests

What two hypothesis are needed for NHST?

1. A null hypothesis (H0)
2. Alternative hypothesis (Halt, H1)

What are alternative hypothesis?

Statements of alternative realities

What do we call tail areas that lie beyond specific values t?

P values

For what can the tables of the t distributions can be for?

To look up tail areas for selected cases of df and t

What three things do we need to know to define the reject regions for values of t?

1. Choice of Halt
2. Choice of alpha
3. Sample df (N-1)

What are the reject rules of obtained p value, using alpha=0.05?

1. If p<.05 reject the null hypothesis
2. If p>.05 do not reject

The question on the page originate from the summary of the following study material:

  • A unique study and practice tool
  • Never study anything twice again
  • Get the grades you hope for
  • 100% sure, 100% understanding
Remember faster, study better. Scientifically proven.
Trustpilot Logo