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In a large population of college-educated adults, the mean IQ is 118 with a standard deviation of 20. What is the probability that a randomly selected adult from this population has an IQ that is greater than 120?
Basic Statistics problem
They found that those with higher levels of cigarette use had lower GPAs, and vice versa. What can you rightfully conclude from this? Why? Be specific about what this kind of information may indicate and mean.
Develop a 99% confidence interval for the population proportion.
A standard deviation of 68. a score is considered outstanding if it is at least 420. what is the % of the scores would be outstanding?
The NAEP test was also given to a sample of 1077 women of ages 21 to 25 years. Their mean quantitative score was 275. Take it as known that the standard deviation of all individual scores is = 60.
Can we conclude that the mean age of the population from which the sample may be presumed to have been drawn is less than 60 years? Let α = .05
The following sample data were obtained from three populations where the variances were not equal, and you wish to compare the populations.
A study of 36 members of the Central Park Walkers showed that they could walk at an average rate of 2.6 miles per hour. The sample standard deviation is 0.4. Find the 95% confidence interval for the mean for all walkers.
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
A sample of 25 concession stand purchases show a mean purchase of $5.29 with a standard deviation of $3.02. However, a later showing of the same movie, a sample of 25 purchases where the mean was $5.12 with a standard deviation of $2.14.
The average cost of repairing a VCR is $80 with a standard deviation of 19. if one VCR is repaired, find the probability the cost is between 70 and 90.
In regression equation, the value of y-intercept indicates the value of Y when the value of X is zero.
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