in order to evaluate the diagnostic accuracy of new rapid test for COVID-19 results of the screening test were compared to the Reference golden standard (PCR test) in 2000 individuals. from 120 individuals who tested negative by the rapid test. only 8 were found COVID-19 positive. from 1880 individuals who tested positive by the rapid test, 176 were found COVID-19 negative. the FP rate is equal to: 38.9% or 2.2% or 61.1% or 60%
Q: A certain drug can be used to reduce the acid produced by the body and heal damage to the esophagus…
A: It is given that the population proportion p is 0.92. The null and alternative hypotheses are given…
Q: A recent newspaper article claims that 72% of car accidents involve some evidence of distracted…
A:
Q: Average IQ scores for young school children are known to be 100 (SD = 15). However, the literature…
A:
Q: FIV (feline immunodeficiency virus) attacks a cat's immune system causing FAIDS (feline acquired…
A: Given Information: The percentage of cats with FIV test positive is 94.7% and 96.1% of cats without…
Q: A genetic expert was attempting to cross a tiger and a cheetah. She predicted a phenotypic outcome…
A: Any assumption about the parameter or probability function of the given data is known as Hypothesis…
Q: The western blot assay is a blood test for the presence of hiv. It has been found that this test…
A: From the provided information, Sample size (n) = 400 Level of significance (α) = 0.05
Q: A researcher randomly selected a sample of n = 500 individuals from a population with µ = 120 and…
A: The question is about hypothesis testing.Given :Randomly selected no. of individuals ( n ) = 500Mean…
Q: Chicken farming is a multi-billion dollar industry, and any methods that increase the growth rate of…
A: The formula of the standard error of the point estimate for the difference is,
Q: You are conducting a study to see if the accuracy rate for fingerprint identification is…
A: Given: z= -2.653 This test is conducted to check whether the accuracy rate for fingerprint…
Q: Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of m= 8.0 parts…
A:
Q: A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent…
A: From the provided information, Sample size (n) = 49 Out of which 33 reported skin improvement. Level…
Q: A COVID-19 test has sensitivity of 90% and specificity of 92%. If base rate of COVID-19 in a…
A: Given information: Sensitivity = True Positive = 90% Specificity = True Negative = 92% Base rate of…
Q: Suppose that the prevalence of breast cancer in a certain population of women is 0.30. Assume that…
A: The prevalence is 0.30 The sensitivity is 0.83 The specificity is 0.90 The formula for the positive…
Q: A psychiatrist devised a short screening test for depression. An independent blind comparison was…
A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…
Q: A researcher tests reaction time of each group of 14 individuals twice once while in a very hot room…
A: t-test for independent means: When two groups of people who are not dependent on each other are…
Q: A lumber company in East Texas is interested in the quantitative traits responsible for faster…
A:
Q: Н : u is ? ? What are the null and alternative hypotheses that the researcher should use for the…
A: Population mean μ=136 mm Hg Population SD σ=16 mm Hg n=150
Q: Several years ago, researchers conducted a study to determine whether the "accepted" value for…
A: The provided information is as follows:The sample mean is .The sample standard deviation is .The…
Q: A clinical trial is planned to compare an experimental medication designed to lower blood pressure…
A: The test hypotheses are given below: From the given information, the claim of the problem is testing…
Q: You are conducting a study to see if the accuracy rate for fingerprint identification is…
A:
Q: The government introduced new laws requiring long distance truck drivers to take minimum rest…
A: From the provided information,The claim is that the proportion of long distance truck drivers who…
Q: The U.S. Office of Personnel Management reports that 51% of federal civilian employees have a…
A:
Q: The Western blot assay is a blood test for the presence of HIV. It has been found that this test…
A: (1) State the values given in the data. From the given information, it is clear that proportion of…
Q: Suppose a test for detecting a certain rare disease has been perfected that is capable of…
A: Theorem of Total Probability: Let A1, A2, ... , An be n mutually exclusive and exhaustive events…
Q: A dental research team investigating a new tooth filling material conducted a test comparing a new…
A: Practical significance: It is the effect size of the testing. The value of the practical…
Q: The supervisor of an orange juice-bottling company is considering the purchase of a new machine to…
A: Given The data is as follows: New machine Old machine Mean x¯1=470 x¯2=460 Standard…
Q: A research study examined the effects of a new drug versus an old drug on hypertension. There were…
A: The objective of this question is to determine if there is a significant difference in the…
Q: A research study in 2019 showed that the prevalence of dietary supplement use among college students…
A:
Q: The mean ±1 sd of ln [calcium intake (mg)] among 25 females, 12 to 14 years of age, below the…
A: Given information: The descriptive statistics for the group of 25 females who took calcium and for…
Q: A new cream that advertises that it can reduce wrinkles and improve skin was subject to a recent…
A: Given : Claim : The cream will improve the skin of more than 60% of women over the age of 50.
Q: A study of 420,002 to cell phone users found that 133 of them develop cancer of the brain and…
A:
Q: Samples of pages were randomly selected from three different novels. The Flesch Reading Ease scores…
A: If p value is greater than alpha we reject the null hypothesis otherwise we fail to reject null…
Q: Three diets for hamsters were tested for differences in weight gain after a specified periods of…
A: Solution Conduct this test using a one-factor ANOVA and a randomized block ANOVA. Anova Table…
Q: In a study of 420,148 cell phone users, 136 subjects developed cancer of the brain or nervous…
A:
Q: medical prescription company was testing a new medication to prevent seizures. They collected data…
A: Univariate and Bivariate data: When only data for one variable is summarized in the study it is…
Q: Results of a poll of a random sample of 3003 American adults showed that 20% do not know that…
A: Given Information: Margin of error = +/- 1.4%
Q: A researcher wants to test the effectiveness of a new drug to treat asthma. One hundred patients…
A: Answer : ANOVA
Q: The U.S. Department of Energy reported that 51.7% of homes were heated by natural gas. A random…
A: Given X=115 n=221
Q: In a cohort study of 300 members of the Men of Leisure Club who took a vacation to the Bahamas, 170…
A: Given, Among 300 members of men , 170 became infected with giardiasis. One hundred twenty nine…
Q: When only two treatments are involved, ANOVA and the Student’s t-test (Chapter 11) result in the…
A: Anova is the measure that used to determine the mean significance between more than three groups. It…
Q: The athletic director at a large university compared the proportions of freshmen (1st year students)…
A: The hypothesis is, Null hypothesis: H0: There is no difference between proportions of freshmen and…
Q: A survey is conducted to determine if there is a difference in the proportion of students, parents,…
A:
Q: Only about 17% of all people can wiggle their ears. Is this percent different for millionaires? Of…
A: State the hypotheses.
Q: A new screening test for Lyme disease is developed for use in the general population. The…
A: given total number of people 300 sensitivity = 60% specificity = 70% sensitivity =…
Q: Researchers wanted to test the hypothesis that living in the country is better for your lungs than…
A: Given: Researchers wanted to test the hypothesis that living in the country is better for your lungs…
Q: A man measures his heart rate before using a treadmill and then after walking on a treadmill for 10…
A: The given data is as follows:Sample size, Sample mean of difference, Sample standard deviation of…
in order to evaluate the diagnostic accuracy of new rapid test for COVID-19 results of the screening test were compared to the Reference golden standard (PCR test) in 2000 individuals. from 120 individuals who tested negative by the rapid test. only 8 were found COVID-19 positive. from 1880 individuals who tested positive by the rapid test, 176 were found COVID-19 negative. the FP rate is equal to: 38.9% or 2.2% or 61.1% or 60%
Step by step
Solved in 2 steps
- A genetics engineer was attempting to cross a tiger and a cheetah. She predicted a phenotypic outcome of the traits she was observing to be in the following ratio: 4 stripes only: 3 spots only: 9 both stripes and spots. When the cross was performed and she counted the individuals she found 50 with stripes only, 41 with spots only and 85 with both. According to the Chi-square test, did she get the predicted outcome?A medical student at a community college in city Q wants to study the factors affecting the systolic blood pressure of a person (Y) Generally, the systolic blood pressure depends on the BMI of a person (B) and the age of the person A. She wants to test whether or not the BMI has a significant effect on the systolic blood pressure, keeping the age of the person constant. For her study, she collects a random sample of 125 patients from the city and estimates the following regression function: Y= 15.50 + 0..90B+1.15A. (0.55) (0 40) The test statistic of the study the student wants to conduct (Ho: B, = 0 vs. H, B, #0), keeping other variables constant is. (Round your answer to two decimal places.) At the 5% significance level, the student will ▼ the null hypothesis. Keeping BMIl constant, she now wants to test whether the age of a person (A) has no significant effect or a positive effect on the person's systolic blood pressure. So, the test statistic associated with the one-sided test the…Please show work in Excel.
- A dietician read in a survey that 85.36% of adults in the U.S. do not eat breakfast at least 3 days a week. She believes that a larger proportion skip breakfast 3 days a week. To verify her claim, she selects a random sample of 66 adults and asks them how many days a week they skip breakfast. 41 of them report that they skip breakfast at least 3 days a week. Test her claim at . = 0.05.On an examination given to 8600 students, Hay’s score of 405 was higher than the scores of 3952 of the students who took the examination. What is the percentile for Hya’s score?According to the National Health and Nutrition Examination Survey (NHANES) sponsored by the U.S. government, a random sample of 712 males between 20 and 29 years of age and a random sample of 1,001 males over the age of 75 were chosen and the weight of each of the males were recorded (in kg). Do the data provide evidence that the younger male population weighs more (on average) than the older male population? Use “Y” for ages 20-29 and “S” for ages 75+. It was found that x̅Y=83.4, sY=18.7, x̅S=78.5, and sS=19.0. a)Suppose the test statistic is t = 2.398. What is the associated p-value? Group of answer choices 0.001 < p-value < 0.002 0.005 < p-value < 0.01 0.01 < p-value < 0.02 0.0005 < p-value < 0.001 b) Suppose the p-value is 0.02 < p-value < 0.04. At α = 0.10 what is the appropriate conclusion to make? Group of answer choices Fail to reject H0 and conclude that the mean weight of all males ages 20-29 is greater than the mean weight of all…
- According to the National Health and Nutrition Examination Survey (NHANES) sponsored by the U.S. government, a random sample of 712 males between 20 and 29 years of age and a random sample of 1,001 males over the age of 75 were chosen and the weight of each of the males were recorded (in kg). Do the data provide evidence that the younger male population weighs more (on average) than the older male population? Use “Y” for ages 20-29 and “S” for ages 75+. It was found that x̅Y=83.4, sY=18.7, x̅S=78.5, and sS=19.0. a) Is the normality condition met for this test? (see picture) No, since the histograms show skewness and outliers . Yes, since both sample sizes are larger than 30. No, since both sample sizes, nY and nS, are less than 30. Yes, since it was stated that the two populations are normally distributed. b)What are the correct degrees of freedom for this test? Group of answer choices 999 1000 1712 1711 711According to the National Health and Nutrition Examination Survey (NHANES) sponsored by the U.S. government, a random sample of 712 males between 20 and 29 years of age and a random sample of 1,001 males over the age of 75 were chosen and the weight of each of the males were recorded (in kg). Do the data provide evidence that the younger male population weighs more (on average) than the older male population? Use “Y” for ages 20-29 and “S” for ages 75+. It was found that x̅Y=83.4, sY=18.7, x̅S=78.5, and sS=19.0. A) What are the correct null and alternative hypotheses? B)What is the parameter of interest? The difference between the mean weight of all males ages 20-29 and the mean weight of all males ages 75+ The mean weight (in kg) The difference between the mean weight of the sample of males ages 20-29 and the mean weight of the sample of males ages 75+ The mean difference between the weights of males ages 20-29 and males ages 75+ c)Is the randomness condition met for…A child dying from an accidental poisoning is a terrible incident. Is it more likely that male child get into poison than a female child? To find this out, data was collected that showed that out of 1830 children between the ager and four who pass from poisoning, 1031 were males and 799 were females. Do the data show that there are more male children dying of poisoning than female children,Test at the 1% level?
- What does am/n mean ?According to Johns Hopkins Medicine, the healthcare providers consider a fever to be 100.4◦F. Data was acquired in a health center that observed 24 adults with COVID- 19. We want to find out if the sample mean of 104◦F body temperature of adults with COVID-19 is significantly higher than the body temperature of a person with fever. Consider the sample SD of 10.2◦F.A researcher randomly selected a sample of n = 500 individuals from a population with µ = 120 and administered an experimental treatment to the sample. What the researcher should expect if the treatment has no significant effect?