In a random sample, 55 nurses who worked in the Covid-19 wing of a private hospital were interviewed, 10 indicated they were diagnosed with Covid-19 in 2020. When 50 nurses who do not work in the Covid-19 wing were selected at random, 8 indicated they were diagnosed with Covid-19 in 2020. Q.1.2.1Calculate the standard deviation of the differences between the sample proportions of nurses who work in the Covid-19 wing and the sample proportions of nurses who do not work in the Covid-19 wing of the hospital. Q.1.2.2Calculate the test statistic, z, of the differences between the sample proportions of nurses who work in the Covid-19 wing and the sample proportions of nurses who do not work in the Covid-19 wing of the hospital.Q.1.2.3Find the probability that the sample proportions of nurses who work in the Covid-19 wing have higher chances of getting Covid-19 than sample

There are two independent samples which are nurses who worked and nurses who do not work. We have to…

Answered: In a random sample, 55 nurses who…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Suppose that a study was conducted to determine if there is a significant difference in the average temperature of individuals before and after COVID-19 boosters were given. The temperatures of a sample of individuals were obtained before the boosters were given. The following day, their temperatures were again measured. The table below shows the data in degrees Celsius. (10 points) Temperature before Temperature after one day. Determine If there is a significant difference in the average temperature of Individuals who were given boosters at 5% level of significance. Assume that the differences in the temperatures follow the normal distribution.
Do people walk faster in an airport when they are departing (getting on a plane) or after they have arrived (getting off a plane)? An interested passenger watched a random sample of people departing and a random sample of people arriving and measured the walking speed (in feet per minute) of each. A hypothesis test is to be performed to determine if the mean walking speed is different between departing and arriving passengers at an airport. Suppose the p-value is 0.14. What is an appropriate conclusion? Choose the correct answer below. O A. There is sufficient evidence at the 5% significance level to indicate that the mean walking speeds for arriving and departing passengers are the same. B. There is not sufficient evidence at the 5% significance level to indicate that the mean walking speeds for arriving and departing passengers are different. C. There is not sufficient evidence at the 5% significance level to indicate that the mean walking speeds for arriving and departing passengers…
Suppose it was found that in a random sample of 200 individuals who were underweight (defined as having a BMI of under 18.5), 8 of them were hospitalized with COVID-19. Of a corresponding group of 400 individuals who were classified as severely obese (defined as having a BMI of at least 45.0), 32 were hospitalized with COVID-19. (a) What are the two sample proportions (to 4 decimal places)? (b) What is the difference between the two sample proportions (to 4 decimal places)? (c) If you were testing whether the probability of being hospitalized with COVID-19 differed between the population of underweight individuals and the population of severely obese individuals, what would be your null hypothesis, either in words or in mathematical terms?
Researchers followed a random sample of 2315 middle-aged men from eastern Finland for up to 30 years. They recorded how often each man went to a sauna and whether or not he suffered sudden cardiac death (SCD). The two-way table shows the data from the study. The researchers will perform a chi-square test for independence to test the hypotheses Ho: There is no association between weekly sauna frequency and suffering from sudden cardiac death in the population of middle-aged men from eastern Finland. H: There is an association between weekly sauna frequency and suffering from sudden cardiac death in the population of middle-aged men from eastern Finland. Weekly sauna frequency What are the chi-square statistic, degrees of freedom, 1 or fewer 2-3 4 or more Total and P-value? Yes 61 119 10 190 O x' = 6.032, df = 2, P-value = 0.9510 SCD No 540 1394 191 2125 O x? = 6.032, df = 6, P-value = 0.4196 Total 601 1513 201 2315 O x? = 6.032, df = 3, P-value = 0.1101 O x? = 6.032, df = 2, P-value =…
During the COVID-19 pandemic, drive-up grocery delivery became very popular with customers. Two US retailers that provide this service are Target and Walmart. Many shoppers prefer to order from only one store to save time, but they wonder if they are spending more money shopping at one store rather than both. The data file Snacks has the prices for 20 identical snack items sold at both retailers in Mankato, Minnesota. Assume that µd is the mean difference (Target - Walmart) in the price of the items. Using α = .05, determine whether or not the price of these grocery items differed significantly. Perform your analysis using MegaStat. Download: Snacks a. What type of analysis should you use to analyze this data? Explain the reason for your choice. b. State the hypotheses for this analysis. c. Calculate the degrees of freedom for this analysis. d. State the Decision Rule for this analysis. e. Perform the analysis and identify the mean price of the Target items, the mean price of the…
When solar panels rated at 270 watts of power are manufactured, the power of the panels is not exactly 270 watts, but is Normally distributed with a mean of 270 watts and a standard deviation of 6.5 watts. When solar panels are connected together in series on a roof, the power generated is limited by the panel with the least power. For example, if three panels of 260 watts, 270 watts, and 280 watts are connected in series, the total power is NOT 260 + 270 + 280 = 810 watts. Instead, it is 3x260 = 780 watts (limited by the 260-watt panel). We need to connect seven panels together in series on a roof. What is the probability that the total power generated will be less than 1820 watts? Click here to view Table Z: The Normal Distribution (page 1). Click here to view Table Z: The Normal Distribution (page 2). The probability is O (Round to three decimal places as needed.)
Researchers asked two groups of people to construct a jigsaw puzzle. One group of 55 people, who listened to soft classical music while working, had a mean construction time of 45 minutes. Another group of 45 people, who worked in silence, had a mean construction time of 55 minutes. Assume the population standard deviations for the construction times for people listening to classical music and people working in silence are 9.5 minutes and 11 minutes, respectively. Find the upper bound of the 99% confidence interval for the difference in population construction times between people listening to classical music as they work and people working in silence. Let the people listening to classical music be the first sample, and let the people working in silence be the second sample. Assume the samples are random and independent. Assume that both the population distributions are normally distributed. Round your answer to two decimal places. 90% confidence=1.645 95% confidence=1.96…
The lecturer are concerned that students who enrolled for the course this semester are spending more time playing online games than revising for their upcoming test. In order to pass the test, students need to spend at least 6 hours per week on the course materials. They conducted a survey of 120 students from Section 10G and 15P for which the result shows that the mean time they spent studying for the course in a week is 5.7667 hours with a standard deviation of 1.6487 hours. Using the critical value z0.025 =1.96 , perform hypothesis testing for mean to test whether or not students spent at least 6 hours weekly to study for the course.
Use the 68-95-99.7 rule to solve the problem. 2) The time it take Claudia to drive to work is normally distributed with a mean of 46 2) minutes and a standard deviation of 5 minutes. What percentage of the time will it take her less than 61 minutes to drive to work?
Looking at the above summary statistics from July 2020 for patients with confirmed Covid-19 in adult critical care, answer the following questions: What is the sample size for patients with confirmed COVID 19 were in Adult Critical Care beds in the sample hospital (Hammersmith Hospital) What is the sample size for All critical care units for Patients with confirmed COVID19 Give a brief explanation of SD Give a brief explanation of IQR How old were the patients in General Adult Critical Care with confirmed COVID19 one SD below the mean at Hammersmith Hospital How old were the patients in General Adult Critical Care with confirmed COVID19 on the 25th centile at Hammersmith Hospital Calculate .
Which one of the following statements is true? Select one: O a. In large samples, there are not many discrepancies between the outcomes of the F test and the LM test O b. Degrees of freedom of the unrestricted model is necessary for using the LM test. O c. The LM test can be used to test hypotheses with single restrictions only and provides inefficient results for multiple restrictions O d. The LM statistic is derived based on the normality assumption
A researcher affirms that the average time that students in the morning and afternoon shifts of an elementary school use social networks are the same. Therefore, independent random samples of 15 students from the morning shift and 17 from the afternoon shift are taken and the following times in minutes are observed: Morning 132 131 132 133 134 128 134 132 134 128 132 133 128 132 142 Evening 125 126 126 134 126 129 137 125 129 140 132 123 137 127 133 131 138 Assuming normality in these data, perform: a)A hypothesis test with a significance level of 0.10 for b) The hypothesis test of the researcher's statement with a significance level of 0.10, considering the result of the hypothesis test in the previous section. a

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	In a random sample, 55 nurses who worked in the Covid-19 wing of a private hospital were interviewed, 10 indicated they were diagnosed with Covid-19 in 2020. When 50 nurses who do not work in the Covid-19 wing were selected at random, 8 indicated they were diagnosed with Covid-19 in 2020.
	Q.1.2.1	Calculate the standard deviation of the differences between the sample proportions of nurses who work in the Covid-19 wing and the sample proportions of nurses who do not work in the Covid-19 wing of the hospital.
	Q.1.2.2	Calculate the test statistic, z, of the differences between the sample proportions of nurses who work in the Covid-19 wing and the sample proportions of nurses who do not work in the Covid-19 wing of the hospital.