STA 220H1F LEC0201 Week 10 Statistical Inference Continued
... the particular signficance test. Testing cannot correct flaws in the data collection design (bias, confounding, lack of randomization). Test results are not reliable if the statements of the hypotheses are suggested by the data. This is called data snooping. If multiple tests are carried out, ...
... the particular signficance test. Testing cannot correct flaws in the data collection design (bias, confounding, lack of randomization). Test results are not reliable if the statements of the hypotheses are suggested by the data. This is called data snooping. If multiple tests are carried out, ...
10.16 and 10.18 DPS Notes - b
... -it is the hypothesis that the researcher hopes is true -p-value: the actual probability of drawing your sample from the null hypothesized population -Statistical Significance: a maximum acceptable probability that we use to reject the null hypothesis when it is true If a sample mean is so different ...
... -it is the hypothesis that the researcher hopes is true -p-value: the actual probability of drawing your sample from the null hypothesized population -Statistical Significance: a maximum acceptable probability that we use to reject the null hypothesis when it is true If a sample mean is so different ...
day9
... attention in school. Anyhow, you think that a new type of organic feed may lead to plumper chickens. As every chicken farmer knows, a fat chicken sells for more than a thin chicken, so you are excited. You know that a chicken on standard feed weighs, on average, 3 pounds. You feed a sample of 25 chi ...
... attention in school. Anyhow, you think that a new type of organic feed may lead to plumper chickens. As every chicken farmer knows, a fat chicken sells for more than a thin chicken, so you are excited. You know that a chicken on standard feed weighs, on average, 3 pounds. You feed a sample of 25 chi ...
Review of key statistical concepts - Penn State Department of Statistics
... making a Type I error to be small (0.05 or 0.01). • Compare the value of the test statistic to the known distribution of the test statistic. • If the test statistic is more extreme than expected, allowing for an α chance of error, reject the null hypothesis. Otherwise, don’t reject the null. ...
... making a Type I error to be small (0.05 or 0.01). • Compare the value of the test statistic to the known distribution of the test statistic. • If the test statistic is more extreme than expected, allowing for an α chance of error, reject the null hypothesis. Otherwise, don’t reject the null. ...
Effect size
... if any, on HIV positive patients. In others words, does a group of AIDs patients given AZT live longer than another group given a placebo. If we conduct the experiment correctly - everything is held constant (or randomly distributed) except for the independent measure and we do find a different betw ...
... if any, on HIV positive patients. In others words, does a group of AIDs patients given AZT live longer than another group given a placebo. If we conduct the experiment correctly - everything is held constant (or randomly distributed) except for the independent measure and we do find a different betw ...
Problem Set II - psychfiles.net
... 3. The Hershey company has been receiving complains about the number of almonds in their chocolate almond bars. Customers believe Hershey’s bars contain fewer almonds than they’ve previously contained because the company is trying to spend less money on their product. In a review of the company’s re ...
... 3. The Hershey company has been receiving complains about the number of almonds in their chocolate almond bars. Customers believe Hershey’s bars contain fewer almonds than they’ve previously contained because the company is trying to spend less money on their product. In a review of the company’s re ...
Notes from Lecture 12
... population parameter we care about. Using the normal distribution, we can then calculate the probability that we would have obtained the sample statistic we have if the hypothesis was correct. ...
... population parameter we care about. Using the normal distribution, we can then calculate the probability that we would have obtained the sample statistic we have if the hypothesis was correct. ...
You construct a 95% confidence interval for the mean time taken to
... You construct a 95% confidence interval for the mean time taken to process a new insurance policy. The values are (11,12) days. Which are the following statements is correct? 1. Only 5% of all policies take less than 11 or more than 12 days to process 2. Only 5% of all policies take between 11 and 1 ...
... You construct a 95% confidence interval for the mean time taken to process a new insurance policy. The values are (11,12) days. Which are the following statements is correct? 1. Only 5% of all policies take less than 11 or more than 12 days to process 2. Only 5% of all policies take between 11 and 1 ...
STAT 555 DL- Short Test 7 Workshop Seven (Se estableció un
... 20. We cannot commit a Type I error when the: a. Null hypothesis is true. b. Level of significance is 0.10. c. Null hypothesis is false. d. Test is a two-tail test. 21. The level of significance can be: a. Any value between -1.0 and 1.0 b. Any positive value c. Any value smaller than 1.645 d. None o ...
... 20. We cannot commit a Type I error when the: a. Null hypothesis is true. b. Level of significance is 0.10. c. Null hypothesis is false. d. Test is a two-tail test. 21. The level of significance can be: a. Any value between -1.0 and 1.0 b. Any positive value c. Any value smaller than 1.645 d. None o ...
Stat 1
... A. It depends on the parameter being estimated. B. It remains the same. C. It decreases. D. It increases. E. It could increase or decrease depending on the value of the point estimate. 10. According to the Central Limit theorem, the sampling distribution of sample means will approach a ...
... A. It depends on the parameter being estimated. B. It remains the same. C. It decreases. D. It increases. E. It could increase or decrease depending on the value of the point estimate. 10. According to the Central Limit theorem, the sampling distribution of sample means will approach a ...
Hypothesis Testing
... fish caught in their netting efforts reflect the population size, the hypothesis they tested is: H: average number of fish per net is higher than 12 (the historical value). Does the data support this hypothesis? We need a philosophical pause here. There are some circumstances wherein it will be very ...
... fish caught in their netting efforts reflect the population size, the hypothesis they tested is: H: average number of fish per net is higher than 12 (the historical value). Does the data support this hypothesis? We need a philosophical pause here. There are some circumstances wherein it will be very ...
Comparison of Means Solutions 1. True or False: A p
... By looking up the p-value on a t-distribution table, with 99 degrees of freedom (will probably need to look up 100 df), we find a p-value p(t>6)<0.0005. This p-value provides strong evidence against the null (we can say we reject the null hypothesis) and in support of the alternative hypothesis. The ...
... By looking up the p-value on a t-distribution table, with 99 degrees of freedom (will probably need to look up 100 df), we find a p-value p(t>6)<0.0005. This p-value provides strong evidence against the null (we can say we reject the null hypothesis) and in support of the alternative hypothesis. The ...
Proportions and t- Student Tests with SPSS
... the test is significant at the 5% level, and we would usually say there is evidence to reject the null hypothesis. If the p-value is less than 0.1 but greater than 0.05 then there is weak evidence in favour of the alternative hypothesis. Finally if the p-value is greater than 0.1 then we would usual ...
... the test is significant at the 5% level, and we would usually say there is evidence to reject the null hypothesis. If the p-value is less than 0.1 but greater than 0.05 then there is weak evidence in favour of the alternative hypothesis. Finally if the p-value is greater than 0.1 then we would usual ...
Hypothesis Testing - Huber Group
... Step 3: Compute the probability of the data in this model Step 4: Make a decision: reject model if the computed probability is deemed to small H0: a model of reality that lets us make specific predictions of how the data should look like. The model is stated using the mathematical theory of probabil ...
... Step 3: Compute the probability of the data in this model Step 4: Make a decision: reject model if the computed probability is deemed to small H0: a model of reality that lets us make specific predictions of how the data should look like. The model is stated using the mathematical theory of probabil ...