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You tell your audience that you ran a t-test to compare the depression levels of 1000 people taking the medication to 1000 people not taking the medication. You point out that the mean level of depr
The mean score for girls was 11.1 with a standard deviation of 3.2. Is there a significant difference between groups? Be sure to state H0, state H1, calculate and state the test statistic, and provi
This past year, a Gallup poll surveyed 1228 households in the U.S about gun ownership. Of those surveyed, 435 said they had at least one gun in their home. Find and interpret the 95% confidence inte
A random sample of 44 UNLV students is taken. The average age in the sample was 20.2 years with a standard deviation of 3.4 years. Construct and interpret a 95 % confidence interval for the average
If a manager believes that the required sample size is too large for a situation in which she desires to estimate the mean income of blue collar workers in a state, which of the following would lead
The weights of bags of candy are normally distributed with a mean of 28 ounces and a standard deviation of .28 ounce. Bags in the upper 3.5% are too heavy and must be repackaged. What is the most a
Which of the following statements is true with respect to the t-distribution?
The larger the sample standard deviation, the narrower will be the interval estimate, all other things being equal.
The American Veterinary Medical Association conducted a survey of veterinary clinics to estimate the proportion that do not treat large animals (cows, horses, etc.).
A true/false pop quiz contains seven questions. What is the probability that when guessing, a student will get at least one question correct? (Round to the nearest hundredth)
In a recent survey of 800 Quebec residents, 28 % thought that Quebec should seperate from Canada. In the same survey, 82 % agreed Quebec society is distinct from the rest of Canada.
Use the following information to answer the question. Suppose that a recent poll of American households about pet ownership found that for households with a pet, 39% owned exactly a dog, 33% owned a
A researcher believe that college students spend a different amount of time talking on the phone than they do instant messaging. She takes a random sample of 12 college students and records the numb
In linear regression the dependent variable must be dichotomous?
Suppose that 50 identical batteries are bing tested. After 8 hours of continuous use, assume that a given batter is still operating with a probability of .70 and has failed with probability of .30.
According to the Census Bureau, 3.21 people reside in the typical American household. A sample of 25 households in Arizona retirement communities showed the mean number of residents per household wa
Find the 95% confidence interval for the mean age at which all children start talking. Use the confidence interval to test whether the mean age at which children start talking is 12.8 months.
Describe in words and statistical terms the relationship between the number of years in education and corresponding salary earned. Discuss the results in terms of this sample and the population in g
What proportion of families spend between $80 and $110 per week on food?
Many teens have posted profiles on sites such as Facebook and MySpace. A sample survey asked random samples of teens with online profiles if they included false information in their profiles. Of 170
A random sample of 2000 men and 2700 women in the age group of 18 to 25 were asked if they still live with their parents. 990 of the men and 903 of the women said "yes". Determine the standard error
After a day, 10 rats were given M and 7 of them succeeded in the maze; only 2 of the 10 control rats were successful. The z-test for "no difference" against "a high proportion of the M group succeed
The plus four 90% confidence for the difference between the proportion of rats that succeed when given M and the proportion that succeed without it is
The total degrees of freedom for an experiment with n1 = 10, n2 = 12, and n3 = 10 is ____.
The average length of a new born baby is 20 inches with a standard deviation of 1 inch.