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If the population mean is assumed to be 20 and the sample standard deviation is 5, a score of 15 would have a Z-value of approximately
If a researcher wants to be 95 percent confident about the results of a study and past studies of the same attitude measure have indicated that about 20 percent of the target market was in favor of
If a researcher wants to conduct a study about how much consumers in a target market segment will spend this year on detergent, and if this study was conducted last year with a standard deviation of
Percent confident of the results with an error of plus or minus $1.50, and if this same type of study conducted last year had a standard deviation of about $29.25, the appropriate sample size for th
If the sample standard deviation is 10.5 and the sample mean is 48 based on a study with a sample size of 120, the 95 percent confidence interval about the mean is between approximately
At alpha levels of .05 and 0.10, test whether there has been a significant decrease in the mean time per mile? The results are given below.
Assume that Westside estimates the demand to be 6,000 loaves per month. What profit or loss is anticipated with this level of demand for the year? (Use 12 months to calculate the year's demand and d
Suppose a life insurance company insures the lives of 1,000 men aged 30. If actuarial studies show that the probability that any 30-year old man will die in a given year to be 0.003, find the probab
A missile has a probability of 0.05 of penetrating enemy defenses and reaching its target. If ten missiles are aimed at the same target, what is the probability that exactly three will hit its targe
The State of OH averages four tax evaders per 100 tax filers. If 50 tax filers are randomly selected from the state, what is the probability of the following:
For a population that is not normally distributed, the distribution of the sample means will ________.
Assume that women's heights are normally distributed with a mean of 63.4 in, and a standard deviation of 1.7 in.
Suppose that we wish to test the hypotheses H0: p= 0.12 versus Ha: p <0.12. If the test statistic is 1.57, find the p-value. Suppose that we wish to test the hypotheses H0: p= 0.12 versus Ha: p ?0.
Is it reasonable to test hypotheses about true average calorie content μ by using a t test? Yes, it is reasonable. No, t test is not applicable here. It depends on the results of t tes
What is the effect size of the new group therapy?
A higher score represents higher levels of anxiety. Participants in a new relaxation program complete the questionnaire after completing the program and have a mean score of 10.2. What is the effect
The mean number of sales per month for those who participated in the new program is 29. Compute the effect size of the new sales program.
47%of Americans when surveyed by a Gallup poll felt that having a gun in the home made them safer than having no gun. The margin of error reported was 3%. Construct an interval estimate
What kind of data analysis method is more appropriate? Why? Conduct the data analysis via SPSS. Report the Levene's test result, test statistic, degrees of freedom, p-value, and effect size. Make
They randomly selected 56 home sales and the sample mean is $118,000 and the sample standard deviation is $3,700. Conduct hypothesis test using ?=.01. Use traditional and p-value approach to hypothe
Assuming that the outcomes listed in part (a) were equally likely, find the probablity of getting two underweight children. Find the probability of getting one overweight child and one underweight chi
Find the correlation r between wine intake and relative risk. Do the data show that women who consume more wine tend to have higher relative risks of breast cancer
The average life expectancy in the United States, L, has been rising steadily over the past few decades, as shown in the table below. Let t be the number of years since 1920, (so t=0 represents the
The table below summarizes results from a study of people who refused to answer survey questions. A market researcher is not interested in refusals of subjects below 22 years of age or over 59. Find
The table below summarizes results from a study of people who refused to answer survey questions. A Market researcher is interested in responses, especially from those between the ages of 22 and 39.