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In order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is selected. The mean of the sample is determined to be 23. The number of degrees of freedom for reading the t value is:
a. 22
b. 23
c. 60
d. 61
What is the major difference between finding significance and confidence intervals using population samples or using population proportions?
The scores are normally distributed with a mean of 165 and a standard deviation of 17. If only the top 20% of the soldiers are selected, what would the cutoff score be?
It was found that in a sample of 215 teenage boys, 59% of them have received speeding tickets. What is the 95% confidence interval of the true proportion of teenage boys who have received speeding tickets?
What are the advantages and disadvantages of the surveying methods you did not used and what type of score did you use why?
We want to determine if the proportion of people in the population who believes this is less than 0.75. What is the p-value?
1. the mean television viewing time for americans is 15 hours per week money november2003. suppose a sample of 60
The number of items rejected daily by a manufacturer because of defect for the last 30 days are 22, 21, 8, 17, 25, 20, 18, 19, 14, 13, 11, 6, 21, 23, 4, 19, 11, 12, 16, 16, 10, 28, 24, 6, 21, 20, 25, 5, 17, 9. Complete this frequency table for the..
Consider the following exponential probability density function: This number represents the time between arrivals of customers at the drive-up window of a bank.
a certain brand of fluorescent light tube was advertised as having an effective life span before burning out of 4000
a. What is the probability that one randomly selected student scores above 1100 on the GRE? b. Describe the sampling distribution of the sample mean for the 16 students.
Research reports an F=ratio with df=3.36 from independent-measures research study. How many treatment conditions were reported in the study what was the total number of participants?
A statistics instructor collected data on the time it takes the students to complete a test. The test taking time is uniformly distributed within a range of 35 minutes to 55 minutes.
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