Replication means repetition of the treatments under investigation.An experimenter resorts to replication in order to average out the influence of chance factors on different experimental units.Thus repetition of treatments results in more reliable estimate than is possible with a single observation.
Precision of the experiment is directly proportional to the square root of replications.
Also the critical values of t decreases as degrees of freedom increases.
So increase in number of replications will result in increased accuracy since in that case even small differences will be detected.
So the statement is true.
By replicating a study and finding significant results again, we can be more confident that the...
The more statistically significant a finding, the less likely it is to be explained away by extraneous variables or design flaws. A. True B. False
The results of a study examining the effectiveness of two instructional strategies indicated a statistically significant difference between the means of the two treatment groups on an achievement test. Which of the following is a reasonable conclusion? a. We can be 95% confident one instructional strategy is better than the other. b. The difference between the two instructional strategies is meaningful. c. It is likely one instructional strategy is more effective. d. Both instructional strategies are equally effective.
True or False 1. If a study finds statistically significant association between exposure and disease, that must mean that every person who is exposed will get the disease. 2. A survey can be reliable but still not close to the true value. 3. Bias is random deviation of results from the truth. 4. Screening for disease is one type of secondary prevention. 5. In order for an infectious disease to occur, there must be a susceptible host.
True or False 1. If a study finds statistically significant association between exposure and disease, that must mean that every person who is exposed will get the disease. 2. A survey can be reliable but still not close to the true value. 3. Bias is random deviation of results from the truth. 4. Screening for disease is one type of secondary prevention. 5. In order for an infectious disease to occur, there must be a susceptible host.
Due to advances in the study of economics and computer models we can always rely on the output that we get from the leading universities, hospitals, and research organizations True or False
study must be valid before its results can be generalized: 6 True or false 7. Experimental studies always have less confounding than observational studies: True or false 8. Lead time is the amount of time that the disease diagnosis is advanced by screening True or false Special cohort studies are the most sensible design for examining many exposures in relation to a single disease. 9. True or false I 10. A causal relationship between an exposure and a disease cannot...
A study had a statistically significant finding that walking 1 mile everyday will reduce BMI and systolic blood pressure in patients with diabetes. Another researcher read the study and indicated patients with end stage renal disease should also walk a mile a day. Which type of validity does this violate?
The results of a study of 258 students who paid a private tutor to help them improve their scores on a standardized test are shown below. The changes in both the Mathematics and Verbal scores for these students are reproduced in the table. Complete parts a through c below. Test score improvements Math Verbal Mean change in score 18 8 Standard deviation of score changes 67 50 a. Construct and interpret a 95% confidence interval for the population mean change...
Why can we be confident that the market for coffee is competitive and that a decrease in supply rather than the greed of coffee growers is the reason for the 2014 rise in price?
when a researcher has non-significant or inconclusive results in a study, they may also choose not to publish this. What are some benefits to publishing inconclusive results of a study?