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Question 15 The incubation period refers to the number of days between being in contact with an infected person and actually showing symptoms of being infected. Health care professionals say that the mean incubation period of COVID-19 is 12 days with a standard deviation of 2 days. This accounts for the 14-day quarantine period. With the recent upsurge of infections due to the different variants of the virus, a group of researchers surveyed 16 confirmed cases. These are their incubation periods: 8, 8, 8.5, 9, 9.5, 10, 10, 10.25, 11, 12, 12.25, 12.5, 12.5, 12.75, 13, & 14.5. Is there enough evidence to show that the mean incubation period has actually decreased? Test at 1% level of significance. Which of the following statements is NOT true? A If the level of significance is decreased by 0.9%, then the Ho would not be rejected. B If the level of significance is increased by 0.9%, then the Ho would be rejected. If the level of significance is increased by 1%, then the Ho would be rejected. D If the level of significance is increased by 1%, then the Ho would not be rejected.Question 16 Philippine Overseas Employment Administration (POEA) claims that the average fees or cost to work abroad excluding the placement fees is at most 13,750 php with a standard deviation of 2,025 php. But a group of placement agencies oppose the claim and found that the average fees or cost taken from 123 OFW's is 14,125 php. Perform a hypothesis testing with a = 5% to see if the claim is correct. Prompts Submitted Answers What is the appropriate null hypothesis? HS 13,750 Determine the test statistic value. Z =2.05 Determine the type of test to use. one - tailed test, right - tailed Find the p - value. 2.02% What decision can you draw from this problem? Reject HoQuestion 17 There are 225 dogs that participated at the National Dog Show that weigh an average of 5 kilos, with a standard deviation of 3.5 kilos. If 30 dogs are selected at random, what is the probability they have an average weight of greater than 4 kilos and less than 7 kilos? A 5.88% B 99.91% C 94.03% D 5.97% Question 18 Sixteen randomly selected business establishments were found to have a mean water consumption of 800 cubic meters a week, with a standard deviation of 175 cubic meters. Construct a 90% confidence interval to estimate the mean weekly water consumption of business establishments. Express the interval in one decimal place. 723.44 12 0 Ho: u=12. Ha: p C 2 ;> D S ; >Question 25 Frontllners at a hospital take the temperature of every one of its more than 1.000 patlents who visit the emergency room. The body temperatures of these patients follow a normal distribution. Suppose that the hospital takes a random sample of 16 patients and calculates the sample mean temperature for those patients. What Is the shape of the sampling distribution of the sample mean temperatures? unknown, no enough information to determine the shape 0 approximately a bell - shaped curve G) a straight line inclined to the right horizontal line