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"Baby Talk Magazine" reported that the mean time a mother spends changing diapers a day is 15.1 minutes. A sample of 12 moms is chosen from your neighborhood, and it is found that the mean time they spend changing diapers was 16.3 minutes with a standard deviation of 1.6 minutes. Using a level of significance of 0.05, test the claim that the average amount of time a mom spends changing diapers is greater than 15.1 minutes.
a. Determine which test statistic you will use: the standard normal distribution, or the student's t distribution. Explain why you chose this test statistic.
b. State the null and alternative hypotheses, and state the claim.
c. Test the claim at a level of significance of 0.05 and discuss your results, should you reject or not reject the null hypothesis, should you reject or except the claim.
A voltmeter is used to measure a known voltage of 100 V. Forty percent of the readings are within 0.5 V of the true value. Estimate the standard deviation for the meter.
How many questions must the test contain in order to reduce the standard deviation of Julie's proportion of correct answers to one-fourth its value for an 100-item test?
discuss the implications of magnitude from 0 to 1 sign or - and probability versus causality for the correlation
a. A firm uses a computer-based training module to prepare 20 machinist to use new numerically controlled lathes. The module contains a test at the end of the course; X is the number who perform satisfactorily on the test.
Draw a scatter diagram with body weight as the independent variable and wing length as the dependent variable. Find the equation of the line of best fit.
a study of 24 graduates of four-year colleges revealed the mean amount owed by a student in student loans was 14381.
Do you think this detection bias would strengthen or attenuate the association between vegetarian diet and learning disabilities? Defend your choice briefly.
part 1shown below are the sales revenue and advertising cost data for seven companies published by international
If a blue ball is selected you win nothing. Let X be the amount that you win. The expected value of X and let the random variable X be a random number with the uniform density curve given below
the quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of
Barbara Flynn is in charge of maintaining hospital supplies at General Hospital. During the past year, the mean lead time demand for bandage BX-5 was 60 (and was normally distributed).
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
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