Observations in the two groups

Reference no: EM131011991

1. Schizophrenia. In the schizophrenia study in Section 2.1.2, the observations in the two groups (schizophrenic and nonschizophrenic) are not independent since each subject is matched with a twin in the other group. Did the researchers make a mistake?

2. True or false? A statistical computer package will only print outa p-value or confidence interval if the conditions for its validity are met.

3. True or false? A sample histogram will have a normal distribution if the sample size is large enough.

Reference no: EM131011991

Questions Cloud

Find the number of roots and their approximate locations : Plot this polynomial in the interval [-100, 100]. Find the number of roots, and their approximate locations in this interval (Include this plot).

Respiratory breathing capacity of individuals : Respiratory breathing capacity of individuals in houses with low levels of nitrogen dioxide was compared to the capacity of individuals in houses with high levels of nitrogen dioxide.

Determining the percent change : After determining the percent change in the sizes of all culture sections, the researcher calculates the standard error for the treatment-minus-control difference using both the paired t -analysis and the two independent sample (Chapter 2) t -anal..

Determining the average commuting times : At the end of two weeks, she has traveled both routes five times and can compare their average commuting times. Why should she not use the t -tools for two independent samples? What should she use?

Observations in the two groups : In the schizophrenia study in Section 2.1.2, the observations in the two groups (schizophrenic and nonschizophrenic) are not independent since each subject is matched with a twin in the other group. Did the researchers make a mistake?

Propose for the statistical analysis : What course of action would you propose for the statistical analysis if it was learned that Vietnam veteran #646 (the largest observation in Display 3.6) worked for several years, after Vietnam, handling herbicides with dioxin? (b) What would you ..

Problem regarding the cloud seeding : 1. Cloud Seeding. What is the experimental unit in the cloud seeding experiment? 2. Cloud Seeding. Randomization in the cloud seeding experiment was crucial in assessing the effect of cloud seeding on rainfall. Why?

Fish oil and blood pressure : Repeat Exercise 19 for the group of men who were given the fish oil diet and then answer these questions: Is there any evidence that the mean reduction for this group is different from zero? What is the typical reduction in blood pressure expected..

The grants finch complete beak data : The data file ex0218 contains the beak depths (in mm) of all 751 finches captured by Peter and Rosemary Grant in 1976 and all 89 finches captured in 1978 (as described in Section 2.1.1). Use a statistical computer program for parts a-d:

User Account

All Pages