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The pulse rates below were recorded over a 30-second time period, both before and after a physical fitness regimen. The data is shown below for 8 randomly selected participants. Is there sufficient evidence to conclude that a significant amount of improvement took place? Assume pulse rates are normally distributed. Test using = 0.05.
· State the null and alternate hypotheses· Calculate the mean and standard deviation· Determine which test statistic applies, and calculate it· Determine the critical value(s).· State your decision: Should the null hypothesis be rejected?
Before 40 42 47 41 52 32 39 49After 33 46 36 55 39 49 52 52
To find the equation of the line of the best fit
In how many ways can at least one of the 3 selected vials have a hairline crack if the order of selection does not matter?
What is the probability that a respondent said neither the Big Ten nor the Pac-10 will have a team in the Rose Bowl?
Do the data indicate that the distribution of preferences for older adults is significantly different from the distribution for college students? Test with .05.
Bolts are randomly selected until a 5 mm bolt is obtained. The outcomes are the sequences of bolts that can be selected. So one outcome is 1, and the other is 342. List the equally likely outcomes.
If you buy a box of Wisk, the probability of getting a scoop is 97%. If you buy 9 boxes over the next several months, what is the probability of missing two scoops?
Change the frequencies to percentages - is there a group more likely to get high salaries.
Is this statistically significant evidence that the true mean diameter is greater than 20 millimeters? Set up the hypothesis, and enter your P-value below, rounded to four decimal places.
Suppose that the distribution of calories is approximately normal with o = 10. Find the probability that a randomly selected chocolate bar will have a) Between 200 and 220 caloies.
The following data are daily price quotations of two stocks: Stock A: 12.50, 12.75, 12.50, 13.00, 13.25, 13.00, 13.50, 14.25, 14.00. Is there a correlation between the two stocks? Explain.
Construct a 99% confident interval for the standard deviation of the amount of vitamin B6 per pill.
How would your colleagues probably react to such a statement of yours? Is their expected (positive or negative) reaction the local cultural habit in your company or is it a wider position common for people in your country?
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