(c) Carry out a formal test of the hypotheses suggested in part (b). Find the test statistic and P-value. (Use a = 0.05. Round your test statistic to two decimal places and your P-value to four decimal places.) P-value =

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Many consumers pay careful attention to stated nutritional contents on packaged foods when making purchases. It is therefore important that the information on packages be accurate. A random
sample of n = 12 frozen dinners of a certain type was selected from production during a particular period, and the calorie content of each one was determined. (This determination entails destroying
the product, so a census would certainly not be desirable!) Here are the resulting observations, along with a boxplot and normal probability plot. (Use this dataset for your analysis software.)
255 244
225
270
260-
250
240
230
220
239 242 265 245 259 248
226 251 233
Calories
265
255
245
235
225
-1.5
0.5
Normal score
-0.5
1.5
(a) Is it reasonable to test hypotheses about mean calorie content u by using a t test? Explain why or why not.
Ⓒ Yes, it is reasonable. The pattern in the normal probability plot is roughly linear, and since the sample was a random sample from the population, the t test is
appropriate.
O No, the t test is not applicable here. The pattern in the normal probability plot is roughly linear. Therefore, the t test is not appropriate.
O Yes, it is reasonable. The pattern in the normal probability plot is not linear, and since the sample was a random sample from the population, the t test is appropriate.
O No, the t test is not applicable here. The sample was not a random sample from the population so the t test is not appropriate.
It depends on the results of t test.
(b) The stated calorie content is 241. Does the boxplot suggest that true average content differs from the stated value? Explain your reasoning.
O Yes, the center of the boxplot is different from the stated value indicating the true average content must differ from the stated
value.
● Not necessarily, it is possible that true average content is 241 and observed differences could be due to sampling variability.
O No, the true average content must be 241 since 241 is inside the box of the boxplot.
O Yes, the true average content must be different from 241 since 241 is inside the box of the boxplot.
(c) Carry out a formal test of the hypotheses suggested in part (b).
Find the test statistic and P-value. (Use a = 0.05. Round your test statistic to two decimal places and your P-value to four decimal places.)
t =
P-value =
State the conclusion in the context of the problem.
O Fail to reject Ho. We have convincing evidence that the stated calorie content is not 241.
O Reject H₂. We do not have convincing evidence that the stated calorie content is not 241.
● Fail to reject Ho. We do not have convincing evidence that the stated calorie content is not 241.
O Reject Ho. We have convincing evidence that the stated calorie content is not 241.
Transcribed Image Text:Many consumers pay careful attention to stated nutritional contents on packaged foods when making purchases. It is therefore important that the information on packages be accurate. A random sample of n = 12 frozen dinners of a certain type was selected from production during a particular period, and the calorie content of each one was determined. (This determination entails destroying the product, so a census would certainly not be desirable!) Here are the resulting observations, along with a boxplot and normal probability plot. (Use this dataset for your analysis software.) 255 244 225 270 260- 250 240 230 220 239 242 265 245 259 248 226 251 233 Calories 265 255 245 235 225 -1.5 0.5 Normal score -0.5 1.5 (a) Is it reasonable to test hypotheses about mean calorie content u by using a t test? Explain why or why not. Ⓒ Yes, it is reasonable. The pattern in the normal probability plot is roughly linear, and since the sample was a random sample from the population, the t test is appropriate. O No, the t test is not applicable here. The pattern in the normal probability plot is roughly linear. Therefore, the t test is not appropriate. O Yes, it is reasonable. The pattern in the normal probability plot is not linear, and since the sample was a random sample from the population, the t test is appropriate. O No, the t test is not applicable here. The sample was not a random sample from the population so the t test is not appropriate. It depends on the results of t test. (b) The stated calorie content is 241. Does the boxplot suggest that true average content differs from the stated value? Explain your reasoning. O Yes, the center of the boxplot is different from the stated value indicating the true average content must differ from the stated value. ● Not necessarily, it is possible that true average content is 241 and observed differences could be due to sampling variability. O No, the true average content must be 241 since 241 is inside the box of the boxplot. O Yes, the true average content must be different from 241 since 241 is inside the box of the boxplot. (c) Carry out a formal test of the hypotheses suggested in part (b). Find the test statistic and P-value. (Use a = 0.05. Round your test statistic to two decimal places and your P-value to four decimal places.) t = P-value = State the conclusion in the context of the problem. O Fail to reject Ho. We have convincing evidence that the stated calorie content is not 241. O Reject H₂. We do not have convincing evidence that the stated calorie content is not 241. ● Fail to reject Ho. We do not have convincing evidence that the stated calorie content is not 241. O Reject Ho. We have convincing evidence that the stated calorie content is not 241.
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