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According to a recent study, 1 in every 5 women has been a victim of domestic abuse at some point in her life. Suppose we have randomly and independently sampled twenty-five women and asked each whe
Assuming that the order in which the winning lottery numbers are selected is irrelevant (i.e., not important), what is probability of someone correctly selecting the six (6) winning lottery numbers
A snack food manufacturer selected a sample of 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and the sample standard deviation is 0.15, find the 95
The test question was if this difference between the test statistics and the stated life of the battery was significant? The .05 significant level was selected for the test. Which is the correct sta
a box contains ten ticket, four marked with a positive number and six with a negative number. all the numbers are between -10 and 10. one thousand draws will be made at random with replacement from
The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 0.5 year (or 6 months). a. What percentage of terminals will last less than 4 yea
a coin will be tossed 100 times. you get to pick 11 numbers. if the number of heads turns out to equal one of your 11 numbers, you win a dollar. which 11 numbers should you pick, and what is your ch
Construct a 90% confidence interval estimate for the difference between two population means given the following sample data selected from two normally distributed populations with equal variances.
the difference "number of heads - number of tails" is like the sum of 100 draws from one of the following boxes. which one, and why?
The research department decided to conduct the test at the 0.05 level of significance whether the modification actually increased the life of the AAA battery. What was their decision rule?
The following is a frequency distribution of grades of a sample of statistics examinations.
Suppose that a Dr. uses the average x-bar for TWO tests taken about a week apart. What is the probability of x-bar < 5000?
Choose a new car or light truck at random and note its color. Here are the probabilities of the most popular colors for vehiclesColor Silver White Black Green Blue Red
Is there sufficient data to determine that these student data reflect population data? Determine using alpha .05 as critical value.
The SAT scores of students are normally distributed with a mean of 950 and a standard deviation of 200.
A random sample of 20 items from the first population showed a mean of 100 and a standard deviation of 15. Find the degrees of freedom for unequal variance test.
At a certain university, the average cost of books per student was $380 per student last semester. In a sample of 55 students this semester, their average cost was $405 with a standard deviation of
a random sample of 61 students were asked how much they spent for classroom textbooks this semester. The sample standard deviation was found to be s-$28.70. How many more students should be included
The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 0.5 year (or 6 months).
Use the .02 significance level. 2. The decision rule is to reject H0 if Z greater than ___? 3. Compute the value of the test statistic. The test statistic is Z=___. 4. What is the p value?
Under what circumstances must a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests? Can the outcomes of nonparametric tests be generalized to populati
If a class of 30 students is chosen at random from the university populaton, find the mean of the number of male students. Find the standard deviation of the number of male students.
There is a linear relationship between the duration x (in seconds) of an eruption of a geyser and the interval of time y (in minutes) until the next eruption. A least-squares regression line of data
annual starting for college graduate with degrees in business administration are generally expected to be between $30,000 and 45,000. Assume that a 95% confidence interval estimate of the population
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000.