Viewed Questions
A researcher is interested in testing whether explaining the processes of statistics helps increase trust in computer algorithms. He wants to test for a difference at the $\alpha=0.05$ level and knows that some people may trust the algorithms less after the training, so he uses a two-tailed test. He gathers pre-post data from 35 people and finds that the average difference score is $\overline{X_{D}}=12.10$ with a standard deviation of $s_{D}=17.39$. Conduct a hypothesis test to answer the research question.
Determine whether you would reject or fail to reject the null hypothesis in the following situations: a. $z=1.99$, two-tailed test at $\alpha=0.05$ b. $z=0.34, z *=1.645$ c. $p=0.03, \alpha=0.05$ d. $p=0.015, \alpha=0.01$
Why do we state our hypotheses and decision criteria before we collect our data?
For a population with a mean of 35 and standard deviation of 7 , find the sample mean of size $n=20$ that cuts off the top $5 \%$ of the sampling distribution.
Questions asked
Breanna Ollech
Numerade educator
What proportion of the area under the normal curve is greater than z = 1.65?
Danielle Fairburn
Draw out distribution of Getting a z-score greater than z = 2.75
Tavis Lam
Under a normal distribution, which of the following is more likely? (Note: this question can be answered without any calculations if you draw out the distributions and shade properly) • Getting a z-score greater than z = 2.75 • Getting a z-score less than z = -1.50
There is a bag with 5 red blocks, 2 yellow blocks, and 4 blue blocks. If you reach in and grab one block without looking, what is the probability it is red?
Why do you think people today feel compelled to get their DNA tested?
Donna Densmore
Calculate the raw score for the following z-scores from a distribution with a mean of 15 and standard deviation of 3: a) 4.0 b) 2.2 c) -1.3 d) 0.46
For a distribution with a standard deviation of 20, find z-scores that correspond to: a) One-half of a standard deviation below the mean b) 5 points above the mean c) Three standard deviations above the mean d) 22 points below the mean
Calculate z-scores for the following raw scores taken from a population with a mean of 100 and standard deviation of 16: a) 112 b) 109 c) 56 d) 88 e) 135 f) 99
Transform the following z-scores into a distribution with a mean of 10 and standard deviation of 2: a) -1.75 b) 2.20 c) 1.65 d) -0.95
Interpret the location (how many standard deviations), direction (above or below the mean), and distance (near or far) of the following z- scores: a) -2.00 b) 1.25 c) 3.50 d) -0.34
