in 2015, average american male weight was 198 lbs.  Experts want to know if this average has increased. A) What is the population and the population parameter for which inferencing is being done? B) Formulate the hypothesis that can be used to test this suspision that average weight has increased C) a sample of 60 american males yielded average weight of 201.5 lbs with a STDEV of 16 lbs.  What can be concluded at a 4% level of significance? D) Would conclusion change if significance were changed to 1%? why or why not

List the sample space of each experiment. Rolling one die and tossing one coin

List the sample space of each experiment. Picking a one-digit number

What is an experiment?

There was a study was conducted and two types of engines, A and B, were compared. Fifty experiments were performed using engine A and 75 using B. The average gas mileage for A was 36 mpg, and 42 mpg for B.  Assume population standard deviations for A and B are respectively 6 and  8. a) What is the point estimate? b) What is the margin of error? c) Construct the 95% confidence interval for the difference of population mean gas mileages for negines A and B

3. Dentists make many people nervous. To assess any effect of such nervousness on blood pressure, the systolic blood pressure of 60 subjects was measured both in a dental setting and in a medical setting (The Effect of the Dental Setting on Blood Pressure Measurement," Amer. J. of Public Health, 1983:1210- 1214). For each subject, the difference between dental setting pressure and medical setting pressure was computed; the resulting sample mean difference and sample standard deviation of the differences were 4.47 and 8.77 mmHg, respectively. o (a) Estimate the true mean difference between blood pressures for these two settings using a 99% confidence level. o (b) Does it appear that the true mean pressure is different in a dental setting than in a medical setting? Explain your reasoning.

To check a new analytical method, a chemist obtains a reference specimen of known concentration from the National Institute of Standards and Technology. She then makes 20 measurements of the concentration of this specimen with the new method and checks for bias by comparing the mean result with the known concentration.   What is the response variable? And what best describe the setting of this experiment? Does it have a two independent sample design or a single sample design?

HELP

A study was conducted of 531 persons injured in bicycle crashes. The subjects were asked if they wore a helmet (yes or no) and sustained facial injuries (yes or no). If we wanted to determine if there was a relationship between helmet wearing and the occurrence of facial injuries, which hypothesis test would we use? a) Pearson Correlation b) Paired samples t-test c) Binomial Proportion Test d) Chi-Square

Construct a 90% confidence interval to estimate the population mean when x = 122 and s = 34 for the sample sizes below. a) n = 20 b) n = 70 c) n = 90 Click here to view page 1 of the critical t-score table. Click here to view page 2 of the critical t-score table.