Exam #2 Review

This is the % of the distribution that falls within one standard deviation of the normally distributed mean.

This is an error in design or execution of a study which produces inaccurate results.

The probability of rejecting the null when the null is true.

This is what sigma (σ) represents in the z-test formula.

The confidence interval gets _____ as the confidence level decreases (from 99% to 90%)

The constant used when calculating the 99% CI of the mean of 10 in a sample of 6 with a sd of 2

Data with a skew of -1.5 are considered normally distributed

The t-value used to calculate the 90% CI for a sample of 10 patients with a mean weight of 105 kg and a SD 11kg

These can make a relationship look different than it actually is.

The normal distribution is used to obtain the constant for CIs when n is greater than 30.

I may work together with my peers on the exam.

This is the type of error a researcher risks if they fail to reject the null

p-value = .24 (alpha = .05) what is statistical conclusion?

I may Google the questions on the exam

When using the CI formula for proportions from which distribution is the constant derived?

When a sample is greater than 30 we use this to standardize a score:

This is the variable that is changed by the other variables the researcher is considering.

z-test statistic is 2.38 (alpha .05) what is statistical conclusion?

alpha = type 1 error

The probability of a score greater than 115 on a normally distributed test with a mean of 100 and a sd of 10

The ability of a test to detect a difference if one actually exists is know as ________

If alpha = .05 the critical value for a two-tailed one-sample z test is this.

The probability of a score less than 115 on a normally distributed test with a mean of 100 and a sd of 10

Non-directional hypothesis = one-tailed test

The process of hypothesis testing starts with this assumption

p-value is .024 (alpha .01) what is statistical conclusion?

A description of how peaked or flat a distribution is:

If the sample size decreases the standard error of the mean (SEM) _________

A one-sample test is used to compare a sample to a population.

If we change our clinical practice as a result of findings we have ______.

A one-sample test is appropriate for ordinal data.

99% CI of the mean score on a statistics exam in a class of 35 students with a mean of 80 and sd of 7

Symmetrical distribution has a skew of 0

A distribution where the median is less than the mean is considered _________

Determining significance: compare obtained value to ____

This is when we fail to reject the null

Determining significance: compare p-value to _____

The obtained value of a two-tailed one-sample z-test is 2.5 (α=.01)

The test statistic also called the obtained value

This is a variable that is not of interest but may influence the outcome of an experiment.