Test Statistic
The difference between a test statistic and a critical value
What is the test statistic is the z-score or t-score calculated from the data given to you while the critical value is determined from the Confidence Level? The test statistic can be compared to the critical value to determine if the data is statistically significant.
The differences between types of confidence intervals
What is z*/t*, s,x,p, what is square rooted, how many n’s there are
The meaning of P being less than alpha
What is sufficient evidence to reject the null hypothesis/the data is statistically significant?
The variables that can change between all of the different variations of the margin of error equation
What is z*/t* and σ/s?
The test statitic of individuals that have a weight of 150lbs or less if the weight of people is normally distributed with µ=180lbs and σ=25lbs if 10 individuals are randomly selected and weighed
What is z=-3.79
The 45% confidence interval for a study that asked 1000 people if they liked dogs and 863 said yes.
What is (.8565,.8695)?
The significance of a study of the effects of sleep on college student test scores if scientists believe that having a good night's sleep causes students to score higher if the scientists took a a sample of 10 college students who did not get a lot of sleep before an exam and found their test scores had a x1=76 and s1=6 and a sample of 10 college students who did get a lot of sleep before an exam and found their test scores had a x2=84 and s2=8. Use a significance level of .05
What is Statistically Significant, Reject Null Hypothesis, P=.0108976?
The approximate sample size of a study of the time it takes for people to get ready in the morning if the time it takes people to get ready in the morning has a confidence interval of 15 minutes to 50 minutes with a sample standard deviation of s=1500 seconds and a t* of 3.62
What is 27 people?
The test statsitic of a study of the weight of snakes if the study sampled 9 snakes and found a sample mean of 4 pounds and a sample standard deviation of 1 pound if the population mean of snakes is 5 pounds if scientists believe that the average weight of snakes is less than 5 pounds.
What is -3?
The 50% confidence interval of the number of teeth sharks have if the number of teeth sharks have a population standard deviation of 25 and if a sample of 13 sharks is randomly selected and it is found that the average number of teeth among these sharks is x=200.
What is (195.32, 204.68
The time it takes to download a video game has a population mean of µ=2 hrs. Dave believes it takes longer than 2 hrs to download a video game and so he randomly downloads 20 video games and finds the average time it takes to download a video game to be 2 hours and 30 minutes and the sample standard deviation to be s=50 minutes. What is the null hypothesis, alternative hypothesis, P-value, and statistical significance of the P-value at a significance level of α=.01.
What is Ho: µ=2hrs, Ha: µ>2hrs, P is between .01 and .005, Statistically significant and reject null hypothesis?
The sample size that gives a margin of error of at least 1.2 for a study of the weights of narwhals that has a sample mean of x̄=1200 and a standard deviation of σ=30lbs with a confidence level of 99%
What is 4,147 narwhals?
The test statistic for the difference between two proportions if the proportion of the number of people who like cheesebugers is 250 out of 300 while the proportion of people who like ice cream is 468 out of 500 if scientists believe the proportion of people who like ice cream is higher than the proportion of people who like cheeseburgers.
What is -4.635?
The upper limit of a 96% confidence interval of a study of the weights of 20 sheep with a sample mean of x̄=200lbs and a sample standard deviation of s=100lbs
What is 249.3 lbs?
The weight of koalas is normally distributed with µ=20 lbs and σ=6lbs. Steve believes the average weight of koalas does not equal 20lbs. He measures the weights of 30 randomly selected koalas and finds their mean weight to equal 18lbs. What is the null hypothesis, alternative hypothesis, P-value, and statistical significance of the P-value at a significance level of α=.05
What is Ho: µ=20lbs, Ha: µ≠20lbs, P=.0672, Not statistically significant and can not reject null hypothesis?
The number of samples that will give you a margin of error of at least .13 if a previous study found that 233 out of 400 people claimed they eat only 1 meal a day with a confidence interval of a 97.3%
What is 71 people?
The t-values that the t-value of a study of the time it takes to cook minute rice lies between if the population mean of minute rice is 1 minute and the time it takes to cook 23 randomly selected minute rice packages have a sample mean of 61 seconds and a sample standard deviation of 2 second.
A: What is 2.183 and 2.508
The sample mean of a set of data if we know the 72.8% confidence interval of farm work is (3,200, 5,000) with a σ=2,000 and a sample size of 250 farmers
What is 4,100 hours?
The test statistic, p value, and statistical significance at a .05 significance level of a study trying to determine if gender affects a person's answer to a hypothetical situation. The study surveyed 5000 men and women and asked them if they thought there were more doors or wheels in the world. Out of the 5000 men 2923 thought there were more wheels in the world than doors. Out of the 5000 women 3061 thought that there were more wheels in the world than doors
What is z=-2.82, P=.004877, Statistically significant P<α
The sample size that gives a margin of error of at least 2 inches for a study of the length of rhinoceros horns that has a sample mean of x̄=8in and a sample standard deviation of s=1in with a t* value of 6.12.
What is 10 Rhinos?