Hypothesis Testing
A researcher believes nightly Tiktok scrolling time increases anxiety.
What type of hypothesis is this?
One-tailed/directional
If my DF for an independent samples T-test is 28 what is my sample total sample size (N)?
30
If my DF1 is 4 how many groups (K) do I have for a One-Way ANOVA?
5
Is Chi-square parametric or non parametric type of test?
non parametric
If I conducted a sign test and saw 8 out of 10 people improved sleep after taking melatonin what is my obtained value?
8
Reject the null
If my critical values for a paired sample t test are +/- 2.58 what type of hypothesis is this?
two-tailed/ non directional
A two -way ANOVA has how many hypotheses
?
3
Counts/frequencies
If I roll a fair die once, what is the probability of getting an even number?
3/6 , 1/2, .5
If I reject the null hypothesis, what type of error could I be making?
Type 1 error/ false alarm
If my obtained t value for a single sample t test was +5.6 and my critical value was +1.86 what decision should I make? And. what conclusion would I state?
reject the null and restate the alternative hypothesis
The formula for F obt in a one way ANOVA is MSbetween/MSwithin true or false?
True
If I wanted to know if people prefer pets equally by comparing the counts people put for each pet what type of test should I do?
If a histogram is normally distributed what shape does it make?
bell curve/normal curve
If I fail to reject/retain the null hypothesis what type of error could I make?
Type 2/ miss
group 2
If I conduct a test to see if gender and major have an effect on sleep what type of test is appropriate? What are the IV(s) and DV?
two-way ANOVA , gender/ major, sleep
If my chi square obtained value for a test of independence between borough and coffee preference is 42.4 and my critical value was 12.3 what conclusion can I make?
reject the null, they are not independent of eachother
what type of test measures if 2 continuous variables are related to one another?
correlation
What is an example of a non-directional/ two-tailed hypothesis ?
anything with difference, effect, change, etc.
If I wanted to compare a group of 15 athletes during the summer training and again during the Fall season what type of test should I do?
Paired samples t- test
What is an example of a repeated measures design/ IV for either a One-way or Two-way ANOVA?
subjects in every condition of IV
A tax representative believes 10% of people file their takes in December, 25% of people file their taxes in February, and 65% file their taxes in April. If I sampled 100 people what would my expected counts be for each month?
10, 25, 65
If a z-score value is negative (-) what does that mean?
Their score is below the mean