Statistics for Non-Statisticians
... For example, suppose we give 1,000 people an IQ test, the mean score for males is 98 and the mean score for females is 100. We want to find if there is a significant difference between male and female scores. We use an independent group t-test (The t-test assesses whether the means of two groups are ...
... For example, suppose we give 1,000 people an IQ test, the mean score for males is 98 and the mean score for females is 100. We want to find if there is a significant difference between male and female scores. We use an independent group t-test (The t-test assesses whether the means of two groups are ...
Does bread lose its vitamins when stored? Small loaves of bread
... the same time, stored for three days and then the vitamin C content was measured. The units are milligrams per hundred grams of flour (mg/100g). Here are the data: Immediately after baking: Three days after baking: ...
... the same time, stored for three days and then the vitamin C content was measured. The units are milligrams per hundred grams of flour (mg/100g). Here are the data: Immediately after baking: Three days after baking: ...
ECON 2201 A – Mock Midterm – Week 10
... Application - z-score for sample distribution of p These help us determine if the information we have in a sample match the information we have from a population. A hotel brand determined they have a 90% approval rate with its customers. In a random sample of 50 people, it received only an 80% appro ...
... Application - z-score for sample distribution of p These help us determine if the information we have in a sample match the information we have from a population. A hotel brand determined they have a 90% approval rate with its customers. In a random sample of 50 people, it received only an 80% appro ...
Probability (Chapter 6)
... Random sampling as a condition for determining probability: For our definition of probability to be correct, we need to assume our sample is attained by random sampling There are 2 requirements for random sampling: Each individual in the population must have an equal chance of being selected ...
... Random sampling as a condition for determining probability: For our definition of probability to be correct, we need to assume our sample is attained by random sampling There are 2 requirements for random sampling: Each individual in the population must have an equal chance of being selected ...
Section 9-3
... significantly outperforms the old one, and medical researchers want to know whether a new therapy performs significantly better. In all these uses, statistical significance is valued because it points to an effect that is unlikely to occur simply by chance. ...
... significantly outperforms the old one, and medical researchers want to know whether a new therapy performs significantly better. In all these uses, statistical significance is valued because it points to an effect that is unlikely to occur simply by chance. ...
Questions for SPS2201: Cardiopulmonary Exercise Physiology
... operationally defined/clear. 2. If possible, random sampling of subjects and assignment of subjects to groups should always be performed. 3. Additional inclusion and exclusion criteria will increase statistical power but likely decrease external validity. 4. Non-significant findings in research shou ...
... operationally defined/clear. 2. If possible, random sampling of subjects and assignment of subjects to groups should always be performed. 3. Additional inclusion and exclusion criteria will increase statistical power but likely decrease external validity. 4. Non-significant findings in research shou ...
Chapter 7 Hypothesis Testing
... The Traditional Method Critical Region: contains values of the test statistic that would be considered unusual, assuming the Ho is true. If the test statistic falls in the critical region, that would be considered unusual, assuming the Ho was true. DECISION: REJECT HO. If the test statistic f ...
... The Traditional Method Critical Region: contains values of the test statistic that would be considered unusual, assuming the Ho is true. If the test statistic falls in the critical region, that would be considered unusual, assuming the Ho was true. DECISION: REJECT HO. If the test statistic f ...
Power and Sample Size - Measurement & Statistics Club (MSC)
... study to see whether, given a limited N, the size of the effect that can be detected is at all realistic . ...
... study to see whether, given a limited N, the size of the effect that can be detected is at all realistic . ...