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My Ask You C-reactive protein (CRP) is a substance that can be measured in the blood. Values increase substantially within & hours of an infection and reach a peak within 24 to 48 hours after. In adults, chronically high values have been linked to an increased risk of cardiovascular disease. In a study of apparently healthy children aged 6 to 60 months in Papua New Guinea, CRP was measured in 90 children. The units are milligrams per liter (mg/l). Here are the data from a random sample of 40 of these children. 0.00 9.29 11.60 22.38 0.00 16.99 15 45 20.84 32 40 0.00 72.97 0.00 43.54 0.00 0.00 26.23 17.76 0.00 0.00 8.52 0.00 0.00 17.76 6.98 5.44 0.00 10.83 0.00 58.08 9.29 16.99 0.00 0.00 0.00 0.00 20.84 14.68 22 38 18 53 19.30 (a) Look carefully at the data above. Do you think that there are outiliers or is thls a skewed distribution? O The distribution is skewed to the right, with many high outliers. O The distribution is skewed to the left, with many high outliers. The distribution is skewed to the left, with a few high outliers. O The distribution is skewed to the right, with a few high outliers. Now use a histogram or stemplot to examine the distribution. (Do this on paper. Your instructor may ask you to turn this in.) (b) Do you think that the mean is a good characterization of the center of this distribution? Explain why or why not O Yes. The mean is always a good measure of center No. The mean should never be used for distributions with outliers. O No. The mean is not the best measure of center for a skewed distribution. O none of the above (c) Find a 95% confidence interval for the mean CRR (Round your answers to two dec mal places.) Lower limit Upper limit Discuss the appropriateness of using this methodology for these data. O This method is appropriate for these data. O The outliers make this methodology somewhat suspect. O The skewness makes this methodology somewhat suspect. Submit Save Assignment Progress Home My Assignments Extension Reques Copyright 2019 Cengage Leaming Inc. All Rights Resened The duributien for four hedroom homes is left skewed hypothesis that the mean asing prices for the two sets of homes are equal venus the the Pvalue, and OPal to reject the null hypothes Thene is signficant evidence of a diference in mean seling prices OFail to neject the null hypothess.There is notsignfcans evidence of aerenceeaning prices O Reject the nul hyos There is sgnficent evidence of a difference in mean selling prices Reject the null hypophesis There is not signiicant evidence o a derence in mean seling prices c) Would you consider using a one-sided atemative for this analyis? Explain why or why not O Yes, we would expect three bedroom homes to be more expensive than four bedroom O ves, we wouild expect four bedroom homes to be more expsive than theee bedroom homes O No, we wouid expect three bedroom homes to be mone expensive than four bedroom homes O Na, a teo sided aternative is appropnane for this setting Give 95% cofdence merval the dmerence in mean wing price. Rund yo r anwen to the nearest whit e) These data are not SRSs from a population Give a Justification for use of the two-sample t procedures in this case. I- 5:27 PM Sat Mar 30 Computers in some vehicles calculate varous quantities related to performance One of these s the lofficiency ongas usually expressed as miles per gaton (mpg) For one vehicle equipped in this way, the mes per gallon were recorded each tume the gas tank was niled, and the computer was then reset Inaddion to the conn causmu m 0allon, driver also recorded the miles per gallon by dividing the miles driven by the number of galons at fa-up The driver wants to determine these calculations are different -up Computer 41.4 50 4 36.6 373 344 450 477 43.0 474 42 Driver 36.5 44.2 37.2 35.6 30.5 40.5 40.0 410 42.8 39.2 Fill-up Computer 43.1 44.4 48.3 461 46.6 39.3 37.6 43.5 444 432 Driver 388 44.5 45.4 45.3 45.7 34.2 35.2 39.8 44.9 47.5 1 2 4589 11 12 13 14 15 16 17 18 19 20 (a) State the appropriate Ho State the appropriate H (b) Carry out the test. (Round your answer for t to four decimal places.) Give the degrees of freedom. Give the P-value. (Round your answer to four decimal places.) Interpret the result O We have strong evidence that the results of the two computations are different we do not have sufficient evidence that the results of the two computations are different. 5:27 PM Sat Mar 30 In each of the following situations explain what is wrong and then either explain why it is wrong or change the wording of the statement to make it true. (a) A researcher wants to test Mo' x,-x2 versus the two-sided alternative He O The null hypothesis Ho should indicate that the two means are not equat Ο Hypotheses should involve», and μ2 (population means) rather than x.-nd x2 (sample means). The null hypothesis (but not the alternative hypothesis) should involve », and (pop ation means) rather than and (sample means) The alternative hypothesis H, should indicate that O This altermative hypothesis indicates a one-sided hypothesis instead of a two-sided hypothesis x2 (b) A study recorded the IQ scores of 100 college freshmen. The scores of the 56 males in the study were compared with the scores of all 100 freshmen using the two-sample methods of this section. O The samples are not independent; we would need to compare the 56 males to the 44 females. O A two-sample method is not appropriate in this situation. The samples are too small to be used for hypothesis testing. O The samples are too large to be used for hypothesis testing. O The sample sizes are too different to be used for hypothesis testing: we would need to have more males in the sample. (c) A two-sample t statistic gave a p-value of 0.94. From this we can reject the null hypothesis with 90% confidence. O A P-value of this size is impossible. 0 we can reject the null hypothesis, but with more than 90% confidence. we can reject the null hypothesis, but with less than 90% confidence O We need the P-value to be negative to reject Ho O We need the P-value to be small to reject Ho A researcher is interested in testing the one-sided alternative Ha: μǐ

Answer 1

Que.1

a. Option 3. Thw distribution skewed to left, with few of high outliers.

b. Option 3.

From Given data finst woe prepart freuency table aroup FTts His tog ram 2.1 10 5 1o 20 20-36 3ο-40 40 SO 50 60 1 Go 70 o 70 80 21 20 ts 1 o 10 5 10 20 30 4o 50 6o To 80

No, mean should not be a best measure of central tendency for skewed data.

c.

Que. 2 and Que.3

Confidence interval for mean cohen σ is unknown 40 二 (7.8) , 18-13)

Please note that image is not clear so I can't provide answers.

Que.4

a. This alternative hypothesis indicates a one sided hypothesis instead of two sided hypothesis.

b. Option 1

C. Option 5

d. Option 1