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I'm trying to determine what happens to the sample size if the level of confidence is reduced from 95% to 90% but the allowable error and the standard deviation remain, the same. Should it be increased, decreased, remain the same or none of these.
Suppose among 312 large city residents sampled, 65 refused to cooperate. What is the margin of error at the 95% confidence level.
There were 25 subjects included in each of the combinations of gender and smoking status. One of the variables measured was the heart rate after six minutes of exercise. A two-way ANOVA is performed with the resulting ANOVA table given below
Construct the following confidence intervals for your data set:
Calculate the value of chi-square. What is your decision regarding H 0 ?
Perform the trend analysis of Pf with incrementally increasing number of the simulation cycles, and calculate the statistical uncertainty in the estimate expressed as the coefficient of variation.
Does this sample give sufficient evidence to conclude that self-esteem scores for group-participation adolescents are significantly different from those of general population? Use two-tailed test with α = .01.
Compute the range, variance, standard deviation, and coefficient of variation. Compute the Z scores. Are there any outliers?
From the given research, compare the major players better at batting than 20 years ago using five step hypothesis.
The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 22 eggs per month with a standard deviation of 2.03 eggs per month.
A psychologist wants to determine if there is a linear relationship between the number of hours a person goes without sleep and the number of mistakes he/she makes on a simple test. The following data is recorded. Determine the regression line equ..
Can we conclude there is a difference in mean number of surgeries performed by hospital or by day of week?
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
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