Boys of a certain age have a mean weight of 85 pounds. A complaint is made that in a municipal children's home the boys are underfed. As one bit of evidence, a random sample these boys are weighed. Use the data below and a significance level of 0.05 to determine if the complaint is legitimate. Click here to open the data in StatCrunch. Weights (Ib.) 85 88 82 84 86 84 90 81 100 69 83 85 69 82 92 79 96 96 81 77 76 73 64 74 87 70 66 92 78 76 Ho: (ho] Please notice that the parameter is already in the hypothesis statements.
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I got these answers but only got 1.2 points out of 3 and am not sure what I did wrong.
Specified Answer for: ho |
= 85
|
Specified Answer for: ha |
> 85
|
Specified Answer for: t |
-2.10
|
Specified Answer for: pval |
0.9779
|
Specified Answer for: D |
Retain Ho
|
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- The average drying time of a manufacturer’s paint is 20 minutes. Investigating the effectiveness of a modifica-tion in the chemical composition of her paint, the manu-facturer wants to test the null hypothesis μ = 20 minutes against a suitable alternative, where μ is the average dry-ing time of the modified paint. (a) What alternative hypothesis should the manufactureruse if she does not want to make the modification in thechemical composition of the paint unless it decreases thedrying time?(b) What alternative hypothesis should the manufactureruse if the new process is actually cheaper and she wants tomake the modification unless it increases the drying timeof the paint?A test of body reaction to the Malaysian citizens who have taken their vaccine was conducted. Selected citizens who got side effect are categorised according to their blood type and the type of vaccine received. From a sample of 250 citizens, 150 of them were administered withSinovac while the rest received AstraZeneca. Table 4 shows the number of citizens who had side effect after being vaccinated. (Question & Table at images)Suppose a sample of 30 students were given a diagnostic test before studying a particular module and then again after completing the module. We want to find out if, in general, our teaching leads to improvements in students’ test scores. Test/analysis: _________________________________________________________________________ Give H0, H1: _________________________________________
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- Biostatistics Outpatients (N = 36) with type 2 diabetes were referred back to the hospital because of the risk of developing chronic kidney disease (CKD) (possible kidney failure). During their follow-up, some patients were diagnosed with advanced (or end-stage) CKD, requiring an extension of their stay in the hospital, while others were readmitted for further medical assessment. Throughout the study, mortality and hospitalization rates, as well as bio-chemical lab test results, were reported. In addition, the attached data slice contains additional demographic data about the patient group. Q1: Write demographic and lifestyle summary with appropriate statistical tools of descriptive statistics that include Age(years), Gender, Level of deprivation [Townsend or socio-economical status SES], and Marital status.Biostatistics Outpatients (N = 36) with type 2 diabetes were referred back to the hospital because of the risk of developing chronic kidney disease (CKD) (possible kidney failure). During their follow-up, some patients were diagnosed with advanced (or end-stage) CKD, requiring an extension of their stay in the hospital, while others were readmitted for further medical assessment. Throughout the study, mortality and hospitalization rates, as well as bio-chemical lab test results, were reported. In addition, the attached data slice contains additional demographic data about the patient group. Q2: Write a statistical summary for patients’ health status that include Smoking status, Glucose level (mmol/L), C-reactive protein (CRP) (mg/L), Blood urea (mmol/L), Serum creatinine (μmol/L), and Albumin level (g/L).Omega-3, finis Exercises 21 and 23 describe an experi-ment investigating the effectiveness of omega-3 fats in treating bipolar disorder. Suppose some of the 30 sub-jects were very active people who walked a lot or got vig-orous exercise several times a week, while others tended to be more sedentary, working office jobs and watchinga lot of TV. Why might researchers choose to block thesubjects by activity level before randomly assigning themto the omega-3 and placebo groups?
- A researcher was interested to compare the effect of 5 different chemicalconcentrations on the growth (in cm) of a particular crop. The plants werearranged in 20 different pots in the lab conditions by using a specific chemical concentration in 4 different pots.a). Which experimental design you will suggest to compare the effect of 5 different chemical concentrations, justify your statement.b). What will be the layout of this experiment, denote 5 different chemicalconcentrations as A, B, C, D and E.c). Identify dependent and independent variables in this experiment. Also identify the experimental unit.d). Draw ANOVA for this particular experiment showing the first two columns.e). Justify, whether the experiment is a single factor experiment or multi-factor experiment?Determine the kurtosis if the data given is a sample.A random sample of 1000 people with known allergies to poison ivy participated in a recent study. Oil from the poison ivy plant was rubbed on a patch of skin. For 500 of the subjects, the oil it was washed off within 5 minutes. For the other 500 subjects, the oil was washed off after 5 minutes. Observed reactions were recorded as "none," "mild," or "strong." The results are summarized in the following table. Reaction Within 5 Minutes After 5 Minutes Row Total NoneMildStrong 4056530 48326126 453391156 Column Total 500 500 1000 Suppose a person selected at random from this sample of 1000 subjects. What is the probability that a strong reaction was observed, given that the oil was washed off within 5 minutes?