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Among 18 patients with depression, the mean number of treatment days was 4.7 with a standard deviation of 9.3. For 10 subjects with bipolar disorder, the mean number of treatment days was 8.8 with a
Using the data shown below, suppose we focus on the proportions of patients who show improvement. Is there a statistically significant difference in the proportions of patients who show improvement
Suppose we have five independent groups (or samples), each of size 9. How many degrees of freedom do we have for the within groups sum of squares in the ANOVA?
The Intelligence Quotient (IQ) test scores for adults are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability we could select a sample of 50 adults and f
For the following distribution: What is the mean of the distribution?
There are 10 AAA batteries in a box and 3 are defective. Two batteries are selected without replacement. What is the probability of selecting a defective battery followed by another defective batter
Marty Rowatti recently assumed the position of director of the YMCA of South Jersey. He would like some current data on how long current members of the YMCA have been members. To investigate, suppos
The new study is to use the 90 percent confidence level. The estimate is to be within 1 percent of the population proportion. What is the necessary sample size?
What is the area under the normal curve between z = -1.0 and z = -2.0?
In a game of chance, a number of draws are made with replacement from a box of tickets; 500 of these tickets are labeled 1 and 450 of these tickets are labeled 1, and the winnings are equal to the s
We would like to find the probability of 34 or more successes using the normal distribution to approximate the binomial. Applying the continuity correction factor, what z-score should be used?
Management is considering placing a new hire in an upper-level management position if the person scores in the upper sixth percent of the distribution. What is the lowest score a new hire must earn
In an illustration of normal probabilty distribution a shaded are represents what?
A clinical trial was conducted to test the effectiveness of the drug zipiclone for treating insomnia in older subjects. Before treatment with zipiclone, 16 subjects had a mean wake up time of 102.8
We know many types of data fall into a normal distribution with most of the observations falling toward the middle. However, sometimes data are outliers or data that are very different - larger or s
Create a 95% confidence interval for the difference between proportions of partners who became infected with HIV.
A sample of 81 account balance of a credit company showed and average balance of $1,200 with a standard deviation of $126. You want to determine if the mean of all account balances is significantly
Does the additional survey information from part (b) have much of an effect on the sample size that is required?
Describe the importance of Tchebysheff's Theorem to the ability to find bounds of probability.
Should you be concerned about the likelihood that it is highly unlikely that a density function will provide a perfect representation of the data?
Explain the concept and application of uniform distribution.
What is the concept of normal distribution and analyze why it is a widely used probability distribution.
Describe what is meant by a binomial experiment. How do binomial experiments apply to each of the four probability