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Keratokonjuktivit ve 1- 5 yaş arası çocuklarda orofaringeal enfeksiyonlar yapan

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When peanuts are packaged in their shells, most shells have two peanuts inside, but some have three and some only have one. A quality control inspector wants to determine if more than 10% of all shells contain just one peanut. If the inspector were to conduct a hypothesis test for p, the proportion of shells with just one peanut, what would be the appropriate pair of hypotheses for the inspector to use?

A medical device company has developed a new needle that they claim reduces the incidence of injection-site reactions for a particular medication. The percentage of patients experiencing injection-site reactions with the current needle is 11%. The new needle is tested on 250 volunteers, and 20 of those volunteers experienced injection-site reactions with the new needle. The z-statistic for the test was calculated to be -1.52. Which of the following statements has the correct P-value and decision for the test at the = 0.10 significance level?

A consumer advocacy group wanted to study whether different airline carriers differed in terms of their delayed flights. In particular, the researchers were interested in the relationship between p1, the proportion of Alpha Airlines flights that were delayed at least 15 minutes, and p2, the proportion of Beta Airlines flights that were delayed at least 15 minutes. A random sample of 1,000 Alpha flights and a separate random sample of 1,000 Beta flights found that 67 of the Alpha fights and 160 of the Beta flights were delayed at least 15 minutes. The conditions for inference were checked and verified.

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