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Question: Average adult American are about one inch taller , but nearly a whopping 25 pounds heavier than they were in 1960, according to a new report from the centers for disease control and prevention (CDC) . The bad news, says CDC is that average BMI (body mass index, a weight -for - height formula used to measure obesity) has increased among adults from approximately 25 in 1960 to 28 in 2002. Boston is considered one of America's healthiest cities in the weight gain since 1960 similar in Boston? A sample of n =25 adults suggested a mean increase of 17 pounds with a standard deviation of 8.6 pounds. Is Boston statistically significantly different in terms of weight gain since 1960?
Apply the appropriate test at a 5% level of significance.
A. Critical t value: +/-
B. Computed statistic
C. Based on comparing the computed statistic to the critical value which of the following is (are) true?
a) There is significant evidence, alpha = 0.05, that the BMI for Boston residents is significantly different than 25.b) There is not significant evidence, alpha =0.05, that the BMI for Boston residents is significantly different than 25.c) Statistically speaking the difference between the BMI for Boston residents and BMI of 25 is 0.d) B & C.
A researcher wanted to invetigate whether there is a significant difference in the average age of instructors, assistant professors, assocated professors and full professors at a university. The faculty was selected at random and their ages were r..
Based on your experience using ANOVA and Nonparametric tests, what additional information would you recommend to the key decision maker solve the challenges given in a company that provides software solutions to wide range of clients?
Are the following statements a valid pair of null and alternative hypothesis?
Researchers at Pharm-X, a pharmaceutical company, are testing and comparing the effects of Drug A and Drug B on participants' allergies. The researchers are using a double-blind procedure to conduct their test.
Assume you always reject null hypothesis, regardless of any sample evidence. Determine the probabiliyt of Type II error? P(Type II error).
Give a 99% confidence interval for the proportion of adults who attended church or synagogue during the week preceding the poll.
A player of a video game is confronted with a series of opponents and has an 80% probability of defeating each one. Success with any opponent is independent of previous encounters. The player continues to confront opponents until defeated.
Using a sample of size n=120, what is the standad deviation of our estimator P? What is the probability that the sample proportion will be at least 0.45?"
Call this the customer's age. Next, for each of 100 customers, draw from the N(10; 2) distribution and call this the customer's length of membership.
The President of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies.
Assistant dean use a sample of application to determine whether the mean examination score for freshman application has changed. State the hypothesses.
Explain and show exactly how you are getting the correct information from your data set and how you are computing the probabilty.
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