Prenatal Vitamin Autism Typical Development Total No vitamin 115 66 181 Vitamin 144 163 307 Total 259 229 488 Conduct the hypothesis test for the stated null and alternative. Round all calculated answers to four decimal places. Họ: The variables use of prenatal vitamins during the three months before pregnancy and autism are independent. HA: The variables use of prenatal vitamins during the three months before pregnancy and autism are not independent. 1. Enter the expected values for the hypothesis test in the table below, rounded to four decimal places. Prenatal Vitamin Autism Typical Development No vitamin Vitamin 2. Calculate the test statistic for this hypothesis test. X? = 3. Calculate the degrees of freedom for this hypothesis test. 4. Calculate the p-value for this hypothesis test. p-value =

Prenatal Vitamin Autism Typical Development Total No vitamin 115 66 181 Vitamin 144 163 307 Total 259 229 488 Conduct the hypothesis test for the stated null and alternative. Round all calculated answers to four decimal places. Họ: The variables use of prenatal vitamins during the three months before pregnancy and autism are independent. HA: The variables use of prenatal vitamins during the three months before pregnancy and autism are not independent. 1. Enter the expected values for the hypothesis test in the table below, rounded to four decimal places. Prenatal Vitamin Autism Typical Development No vitamin Vitamin 2. Calculate the test statistic for this hypothesis test. X? = 3. Calculate the degrees of freedom for this hypothesis test. 4. Calculate the p-value for this hypothesis test. p-value =

Name: Prenatal vitamins and Autism. Researchers studying the link between pr
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Description: Prenatal vitamins and Autism. Researchers studying the link between prenatal vitamin use and autism surveyed the mothers of a random sample of children aged 24 - 60 months with autism and conducted another separate random sample for children with typ

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)

6th Edition

ISBN:9781337111348

Author:Bruce Crauder, Benny Evans, Alan Noell

Publisher:Bruce Crauder, Benny Evans, Alan Noell

Chapter5: A Survey Of Other Common Functions

Section5.6: Higher-degree Polynomials And Rational Functions

Problem 5E: Population Genetics In the study of population genetics, an important measure of inbreeding is the...

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Population Genetics In the study of population genetics, an important measure of inbreeding is the proportion of homozygous genotypesthat is, instances in which the two alleles carried at a particular site on an individuals chromosomes are both the same. For population in which blood-related individual mate, them is a higher than expected frequency of homozygous individuals. Examples of such populations include endangered or rare species, selectively bred breeds, and isolated populations. in general. the frequency of homozygous children from mating of blood-related parents is greater than that for children from unrelated parents Measured over a large number of generations, the proportion of heterozygous genotypesthat is, nonhomozygous genotypeschanges by a constant factor 1 from generation to generation. The factor 1 is a number between 0 and 1. If 1=0.75, for example then the proportion of heterozygous individuals in the population decreases by 25 in each generation In this case, after 10 generations, the proportion of heterozygous individuals in the population decreases by 94.37, since 0.7510=0.0563, or 5.63. In other words, 94.37 of the population is homozygous. For specific types of matings, the proportion of heterozygous genotypes can be related to that of previous generations and is found from an equation. For mating between siblings 1 can be determined as the largest value of for which 2=12+14. This equation comes from carefully accounting for the genotypes for the present generation the 2 term in terms of those previous two generations represented by for the parents generation and by the constant term of the grandparents generation. a Find both solutions to the quadratic equation above and identify which is 1 use a horizontal span of 1 to 1 in this exercise and the following exercise. b After 5 generations, what proportion of the population will be homozygous? c After 20 generations, what proportion of the population will be homozygous?
A human factors psychologist is interested in how alcohol impacts driving performance. A sample of participants was randomly assigned into one of three different conditions of alcohol blood levels (abl). The participants then operate a driving simulator and each participant was measured on how much time (in seconds) they spent on a target when steering. The more time they spend on a target, the better their driving skills. What can the psychologist conclude with an α of 0.01? abl 1 abl 2 abl 3 221192171247234281238171 180146178134200170208156 180132172137154154176178 A) Obtain/compute the appropriate values to make a decision about H0.critical value = ; test statistic = Decision: B) Compute the corresponding effect size(s) and indicate magnitude(s).η2 = Magnitude= C) Conduct Tukey's Post Hoc Test for the following comparisons:2 vs. 3: difference = 1 vs. 3: difference = Conduct Scheffe's Post Hoc Test for the following comparisons:1 vs. 3: test statistic = 1…
C) will the researcher reject the null hypothesis? a) Yes, because the test statistic falls in the critical region b) No, because the test statistic falls in the critical region c) No, because the test statistic does not fall in the critical region d) Yes, because the test statistic does not fall in the critical region
A nutrition study investigated knowledge about fruit juices. The study was conducted in a pediatric clinic. Accompanying parents were asked to classify a national brand of “fruit drink”, that contains less than 10% fruit juice, as 100% fruit juice, fruit juice mix, or no fruit juice at all. The investigators asked 150 parents. The table contains the results. Juice Content Gender Female Gender Male Total 100% 15 15 30 1%-99% 55 25 80 0% 30 10 40 100 50 150 The chi‑square statistic for the null hypothesis of independence has: - 6 degrees of freedom. - 3 degrees of freedom. - 2 degrees of freedom. - 4 degrees of freedom.
Z-Test Z-Test Inpt: Data Stats μ≠60 μ0:60 z=−1.97202659 σ:3.75 p=0.04860657 x:58.75 x=58.75 n:35 n=35 μ:≠μ0<μ0>μ0 Calculate Draw Use the calculator displays to the right to make a decision to reject or fail to reject the null hypothesis at a significance level of α=0.10. Choose the correct answer below. A. Since the P-value is less than α, reject the null hypothesis. B. Since the P-value is greater than α, fail to reject the null hypothesis. C. Since the P-value is greater than α, reject the null hypothesis. D. Since the P-value is less than α, fail to reject the null hypothesis.
3.) a chi square test has been used to test the relationship between gender and support for abortion. The null hypothesis has been rejected. What may be concluded? a. gender and support for abortion are not related b. support for abortion depends on gender c. females are more supportive of abortion d. males are more supportive of abortion 4.) if the distribution of the scores of one variable changes across the values of another variable, the variables: a. are associated to some extend b. have a statistically significant realtionship c. have a cause and effect relationship d. are perfectly associated
Ethnicity and Movie Admissions Are movie admissions related to ethnicity? A 2007 study indicated the following numbers of admissions (in thousands) for two different years. At α=0.01 level of significance, can it be concluded that the movie attendance by year was dependent on ethnicity? Caucasian Hispanic African-American Other 2006 920 235 170 90 2007 925 302 175 69 H0: Movie attendance by year is (DEPENDENT ON or INDEPENDENT OF) ethnicity: Claim or not?H1: Movie attendance by year is (DEPENDENT ON or INDEPENDENT OF) ethnicity Claim or not? Find the critical value Compute the test value: X^2= Reject or Do not reject the null hypothesis Summarize: Is there or is there not enough evidence to reject the claim?Is there or is there not enough evidence to support the claim?
Test the claim that the mean GPA of night students is larger than 2.4 at the 0.005 significance level.The null and alternative hypothesis would be: A.) H0:p=0.6H1:p<0.6 B.) H0:μ=2.4H1:μ≠2.4 C.) H0:μ=2.4H1:μ<2.4 D.) H0:p=0.6H1:p≠0.6 E.) H0:p=0.6H1:p>0.6 F.) H0:μ=2.4 H1:μ>2.4 The test is: A.) two-tailed B.) right-tailed C.) left-tailed Based on a sample of 40 people, the sample mean GPA was 2.41 with a standard deviation of 0.06The test statistic is:____________ (to 2 decimals)The p-value is: ____________ (to 2 decimals)Based on this we: A.) Fail to reject the null hypothesis B.) Reject the null hypothesis
In a chi-square test, if you are able to reject the null hypothesis at alpha = .05, you can conclude: a) there is no association between the variables b) there is some association between the variables c) there is a very weak association between the variables d) there is a very strong association between the variables The degrees of freedom for a chi-square test for a two way crosstab with four rows and three columns is: a) 9 b) 6 c) 12 d) 7 If we conducted a hypothesis test to determine if there is a linear relationship between postnatal depression scores and antenatal depression scores then which of the following would constitute a Type 2 error a) Decide that there is no relationship between the postnatal and antenatal depression scores when a significant relationship does exist. b) Decide that there is a significant relationship between the postnatal and antenatal depression scores when there is not.
A. State the null hypothesis H0 and the alternative hypothesis H1 B. Find the value of the test statistic. (Round to three or more decimal places.) C. Find the two critical values at the 0.10 level of significance. (Round to three or more decimal places.) .
A local school district is considering a new math curriculum. Due to limited resources school administrators decide to pilot the curriculum on a sample of 20 students randomly selected from the districts five elementary schools. The students’ average math score prior to the implementation of the math curriculum was 60 (s = 5). After three months of using the new math curriculum students’ average math score was 85 (s = 3). (1) State the null and alternative hypotheses for this study (2) What is the dependent and independent variable for this study (3) What test statistic/hypothesis test would you select to determine if the two means are significantly difference at the alpha .05 level? (4) What critical value would you use to make your decision to reject or retain the null hypothesis at alpha .05?
Examine the relationship between these variables by testing both statistical significance and strength of association. Use chi-square for significance and choose the appropriate measures for strength of association (Phi, Cramer’s V, Lambda, or Gamma). Set alpha to .05. State the null and research hypotheses: H0: H1: What is the obtained chi-square value? What is the significance level (p-value) for the obtained chi-square? Should we reject or fail to reject the null hypothesis? Is there a statistically significant relationship between these variables? Which measure of association would be most appropriate for these variables? What is the value of the measure of association? Interpret your findings by explaining in full sentences whether there is a statistically significant relationship or not and the strength of the relationship. Also explain any patterns you see in the percentages: