A case control study was carried out to investigate the relationshipbetween Vitamin D levels and individuals who contracted COVID-19needing hospitalisation. Table 2 shows the results of the study.Table 2Vitamin D levelsOptimal >25ng/mLMild deficiency 10ng/mL-24ng/mLSevere deficiency >10ng/mLTotalHospitalised with COVID-19YesNo339825156V44148120.90 0.95 0.975 0.99 0.995 0.9991 2.71 3.84 5.02 6.63 7.88 10.837.38 9.21 10.609.35 11.34 12.842 4.61 5.993 6.25 7.814 7.78 9.4913.8216.2711.14 13.28 14.86 18.47204Total(b) How many degrees of freedom are there?Table 3: Selected Quantiles for chi-squared distributions(a) Calculate the chi-squared test statistic for the association betweenVitamin D levels and needing hospitalisation for individuals whocontract COVID19.7724637360

(a) Null hypothesis: Alternative hypothesis:

Answered: A case control study was carried out to…

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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Dental disease in domestic cats is commonly associated with the accumulation of plaque on the teeth. A cat food manufacturer is studying the accumulation of plaque on the teeth of cats from a certain population. The accumulation of plaque is assessed using a fluorescent light technique (FLT), where an evaluator reviews images of the cat’s teeth and assigns an overall rating from 0 to 100, with lower values indicating less plaque. A previous study indicates the population distribution of the FLT ratings for the teeth of cats is bimodal with mean μ=59 and standard deviation σ=20. (a) Compare the shapes of the sampling distributions of the sample mean FLT rating for random samples of 3cats and for random samples of 60 cats from the population. Explain your answer. (b) Which of the following would be more likely to obtain from the population? • A random sample of 100 cats having a mean FLT rating that is less than 54 or • A random sample of 400 cats having a mean FLT rating that…
619-dt-content-rid-2820000 1/courses/MTH2210C_FS2020/MTH%202210-C%20 Consider the following two sets of data: Data set 1: 1|Page 62 83 91 100 78 96 87 69 Which set of data is uniform? ii. Interprete the box plots for the two sets of data Comment on the shape of the data using quartiles ii. 另的刀2引的以的的印万%z2 的

The manager of a political party wants to find out the association between the campaign spending (Large, medium and small) and the vote obtained (Majority, Average and minority). Use Chi-squared hypothesis test for association to test that there is an association between the variable in campaign spending and the variable in vote obtained with five percent level of significance. The manager uses MS excel to calculate the Chi-squared stat value and the result is 8.874. Critical value: At 1% = 13.277 :At 5% = 9.488 :At 10% = 7.779 1. State the decision rule 2. Conclusion and decision 3. State the alternative hypothesis and the null hypothesis
A local veterinarian uses Z-scores to determine if newborn puppies of certain breeds are severely underweight, underweight, overweight, severely overweight, or within a typical weight range for their breed. Z-score Diagnosis Severely underweight Between -4.0 and -3.0 Underweight Less than -4.0 Between -3.0 and 3.0 Within the normal range Between 3.0 and 4.0 Overweight Severely overweight Greater than 4.0 Breed Mean (pounds) Standard deviation (pounds) Siberian Husky 23.2 2.5 Golden Retriever 31.5 2.1 Chow Chow 18.5 2.4 Shiba Inu 13.9 1.2 (a) What values would be considered to be normal for a hypothetical Siberian Husky puppy? Between and Enter an integer or decimal number (more. Report these answers to one decimal place (nearest tenth). (b) Show calculations and explain your reasoning.
An experiment was carried out to compare the sound distortion produced by 4 different types of coating on magnetic tape. The ANOVA table for this data is given below, where X indicates a missing value. Source Degrees of Freedom Sum of Squares Mean Squares IF Treatment X 14.49 X Error X X X Total 49 165.69 Compute the F statistic. Give your answer to 2 decimal places.
A study was conducted to determine if the performance of a certain type of surgery on young horses had any effect on certain kinds of blood cell types in the animal. Fluid samples were taken from each of six foals an hour after the operation. Suppose that the data on WBC leukocytes follow the normal distribution. One sample Chi-squared test for variancedata: wbcX-squared = 3.5321, df = 5, p-value = 0.3815alternaative hypothesis: true variance is less than 4 Question: Is there evidence to say that the variance of WBC leukocytes is less than 4? State the conclusion based from the results of the test. Choices:- There is no sufficient evidence that the variance of WBC leukocytes is less than 4.- There is a sufficient evidence that the variance of WBC leukocytes is less than 4.
widely used as dielectrics and coolants in electrical systems in the past. They were found to be a major environmental contaminant in the 1960s. In a study, the mean PCB content at each of thirteen sites was reported for the years 1982 and 1996 (from “The ratio of DDE to PCB concentrations in Great Lakes herring gull eggs and its use in interpreting contaminants data”, Journal of Great Lakes Research 24 (1): 12-31, 1998). The data are below.Site:12345678910111213198261.4864.4745.5059.7058.8175.9671.5738.0630.5139.7029.7866.8963.93199613.9918.2611.2810.0221.0017.3628.207.3012.809.4112.6316.8322.74(a) Which test would be more appropriate in this case: a t-test for the difference between two population means, or a paired t-test? Why?(b) Do the data provide sufficient evidence to support the claim that the mean PCB level has decreased in the region? Be sure to check all assumptions, write the null and alternative hypotheses, calculate the appropriate test statistic, calculate the p-value,…
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Data for head injury measurements (in HIC, which is a standard head injury criterion) from samples of small, midsize, and large cars involved in the standard crash test were used to produce the accompanying ANOVA table. Using a 0.05significance level, test the claim that the different size categories have the same mean head injury measurement. Does the size of a car appear to affect head injuries? sum of squares df Mean Square F sig Between Groups 237217.926 2 118608.963 4.851 0.016 Within Groups 660161.205 27 24450.415 Total 897379.131 29 Dialog content ends PrintDone What are the hypotheses to test? H0: H1: The test statistic is (Round to two decimal places as needed.) Identify the P-value. The P-value is (Round to three decimal places as needed.) ▼ Fail to reject Reject H0. Since the P-value is ▼ less greater than the significance level, there ▼…
Show the 4-Step Method in testing significance of mean difference in the following case:A topic of recent clinical interest is the effect of different contraceptive methods on fertility. Suppose we wish to compare how long it takes users of either oral contraceptives (OCs) or diaphragms to become pregnant after stopping contraception. A study group of 20 OC users is formed, and diaphragm users who match each OC user with regard to age (within 5 years), race, parity (number of previous pregnancies), and socioeconomic status (SES) are found. The investigators compute the differences in time to fertility between previous OC and diaphragm users and find that the mean difference đ (OC minus diaphragm) in time to fertility is 4 months with a standard deviation (sd) of 8 months. Can we conclude that previous OC users take a significantly longer time to become pregnant than do previous diaphragm users?

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