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A paired-samples test is reported as t(18) = 1.73. Make a decision about this test, assuming a two-tailed hypothesis test with a p level of 0.05.
Number of standard deviations a sample is from the population mean. Number of standard deviations an individual score is from the sample mean.
A researcher studies 45 volunteer citizens from a small community and asks them about the amount of caffeine (in milligrams) they ingest before and after lunch each day, a phenomenon that imagine we
In a paired-samples t test, the null hypothesis posits that the mean of the comparison distribution is:
With very few degrees of freedom, the test statistic:
For the single-sample t test, the confidence interval is centered around the:
When conducting a paired-samples t test, we compare our sample mean difference to:
When conducting a paired-samples t test, we can assess the practical importance of our obtained results by calculating:
If the standard deviation for a population, as estimated from a sample, is s = 5.6, then the standard error for a sample size of N = 16 is:
We draw a ball from a bag that contains four red balls and eleven white balls. We replace the ball and draw another ball. What is the probability that both balls are white balls?
In a certain parking lot, 45% of the cars have four doors, 16% of the cars are blue, and 4% of the cars have four doors and are blue. What is the probability that a car chosen at random will have ei
Find the probability that a card drawn from a standard deck of playing cards will be either a four or a diamond.
Find the area under the normal curve between 0.9 standard deviations on both sides of the mean.
The distribution of grades on a certain test has a mean of 85.5 with a standard deviation of 11.2. There are 400 tests. Assuming that the grades are normally distributed, predict the number of stude
A data set consists of 83 test scores. Over a long period it has been found that the mean and standard deviation for these scores are known and that the scores are normally distributed. How many sco
At one college, GPA's are normally distributed with a mean of 2.8 and a standard deviation of 0.4. What percentage of students at the college have a GPA between 2.4 and 3.2?
Bottles of juice of one brand are supposed to contain 16 fluid ounces of juice. The table below shows the amount of juice in 60 randomly selected bottles.
Christine is currently taking college astronomy. The instructor often gives quizzes. On the past seven quizzes, Christine got the following scores: 53 10 276 28 12 51 62 Compute the standard deviati
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 280 hours and a standard deviation of 5 hours. What percentage of the bulbs have lifetimes that lie within
A certain grade egg must weigh at least 2 oz. If the weights of eggs are normally distributed with a mean of 1.5 oz and a standard deviation of 0.4 oz, approximately how many eggs in a random sample
A data set consists of 72 test scores. Over a long period it has been found that the mean and standard deviation for these scores are known and that the scores are normally distributed.
A data set consists of 247 test scores. Over a long period it has been found that the mean and standard deviation for these scores are known and that the scores are normally distributed. How many sc
A left-tail area in the chi-square distribution equals 0.95. For df=10, the table value equals?