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Forty-nine (49) high school freshmen were randomly selected for a national survey. Among survey participants, the mean grade-point average (GPA) was 2.7, and the standard deviation was 0.4. What is
Molly Dymond and Kathleen Taylor are considering the possibility of teaching swimming to kids during the summer. A local swim club opens its pool at noon each day, so it is available to rent during
Your friend is working for the engineering department and makes $65 per week. The probability that your total earnings in 100 weeks are more than hers is approximately?
For a population with a mean of µ = 50 and a standard deviation of ? = 10, how much error, on average, would you expect between the sample mean (M) and the population mean for:
A New York restaurant would like to estimate the average amount customers spend for dinner. A sample of size 49 customers resulted an average of $32.60. Assume the population standard deviation is
How likely is it to obtain a random sample of n = 16 jurors with an average age greater than or equal to 48.9? Is it reasonable to conclude that this set of n = 16 people is not a representative rando
The stock of WalMark Stores, Inc., trades on the New York Stock Exchange under the symbol WMS. Historically, the price of WMS goes up with the increase of the Dow average 60% of the time and goes do
For a population with a mean of µ = 60 and a standard deviation of a σ = 24, find the z-score corresponding to each of the following samples.
People are selected to serve on juries by randomly picking names from the list of registered voters. The average for a registered voters in the county is µ = 39.7 years with a standard deviati
What are the z-score values that form the boundaries for the middle 95% of the distribution of sample means? Compute the z-score for M = 89 for a sample of n = 25 scores. Is this sample mean in the mi
Use the emperical rule to estimate the number of farms whose land and biulding values per acre are between $1200 and $1400.
heights of men on a baseball team have a bell shaped distribution with a mean of 183 cm and a standard deveation of 7cm. Using the empirical rule whats your approximate percentage of men between the
The Dallas Police Dept. Feel that a higher percentage of women work there than in neighboring Waco city. To test this, they randomly select 1000 women in each city and find that in Dallas, 622 women
For a population with a mean of u= 60 and a standard deviation of o= 24, find the z-score corresponding to each of the following samples.
The weekly amount of money spent on maintenance and repairs by a printing company was observed, over a long period of time, to be approximately normally distributed with a mean of $500 and a standa
What is the difference between significance level and a p-value? Explain in detail.
There are two conditions that must be met to determine if the distribution is a probability distribution. What are the two conditions?
Is this sample of 25 exam scores inconsistent with the hypothesis that the true variance is 64 (i.e.,s = 8)? Use the 5 percent level of significance in a two-sided test. Show all steps, including th
Find the maximum likelihood estimate of the parameter θ, for a Uniform [0,θ] distribution.
A normal distribution has m = 80 and s = 10. What is the probability of randomly selecting a score greater than 75 from this distribution?
Using z-scores, a population with m = 37 and s = 6 is standardized so that the new mean is m = 50 and s = 10. How does an individual's z-score in the new distribution compare with his/her z-score in
If you were given a large data set such as the sales over the last year of our top 1,000 customers, what might you be able to do with this data? What might be the benefits of describing the data?
Does red wine protect moderate drinkers from heart disease better than other alcoholic beverages? Red wine contains substances called polyphenols that may change blood chemistry in a desirable way.
A study was performed at a university to analyze whether the preference for hamburgers or fried chicken is related to the gender of the student. This table lists the results of the study. At ? = 0.0