Question #1

Anystate Auto Insurance Company took a random sample of 360 insurance claims paid out during a 1-year period. The average claim paid was $1510. Assume σ = $242. Find a 0.90 confidence interval for the mean claim payment. (Round your answers to two decimal places.)

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Find a 0.99 confidence interval for the mean claim payment. (Round your answers to two decimal places.)

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Question #2

Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 76 students in the highest quartile of the distribution, the mean score was x = 178.30. Assume a population standard deviation of σ = 7.99. These students were all classified as high on their need for closure. Assume that the 76 students represent a random sample of all students who are classified as high on their need for closure. Find a 95% confidence interval for the population mean score μ on the "need for closure scale" for all students with a high need for closure. (Round your answers to two decimal places.)

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HW 17

A student decides to test a college administrator's claim that more than 40% of students have part-time jobs. She collects data, and finds that 66 out of 141 students surveyed had part-time jobs. Test the claim that more than 40% have part-time jobs at the 0.05 significance level.

*What is the null hypothesis?                            [ Select ]                       ["H0: p=0.4", "HA: p=0.4", "H0: p>0.4", "H0: p<0.5"]      

*What is the alternative hypothesis?                            [ Select ]                       ["H0: p=0.4", "HA: p=0.4", "HA: p>0.4", "H0: p>0.4"]      

*This test is                            [ Select ]                       ["two tailed", "left tailed", "right tailed"]      

*The test statistic is                            [ Select ]                       ["0.0494", "66/141", "0.468", "1.65"]      

*The P-value is                            [ Select ]                       ["0.0413", "0.0494", "66", "1.65", "0.468", "141"]      

*What is the conclusion?                             [ Select ]                       ["Reject the null hypothesis. There is insufficient evidence to conclude that more than 40% of students work part-time jobs.", "Fail to reject the null hypothesis. There is insufficient evidence to conclude that more than 40% of students work part-time jobs.", "Reject the null hypothesis. Evidence indicates the proportion of students working part-time jobs is higher than 40%.", "Fail to reject the null hypothesis. Evidence supports the claim that 40% of students work part-time jobs."]      

3. We would like to know whether, on average, students learn better in a self-paced or in an instructor-paced computer learning environment. We randomly assigned 40 BL131 students to self-paced sessions and a different 40 students to an instructor-paced sessions for one unit and recorded the exam scores for that unit. The two-sided p-value for the comparison was 0.01. alpha = 0.05.

A) State your conclusion in context and say why you reached that conclusion.

We would like to know whether students learn better in a self-paced- or in an instructor-paced computer learning environment. We randomly assigned 40 BL131 students to self-paced sessions and a different 40 students to an instructor-paced sessions. Here are all the pieces of information from the analysis:

5. State the null and alternative hypothesis for this test.

6. Our test statistic is (xbar1-xbar2) but to actually get the critical values and p-values we use a t-ratio. What, in plain English, is the t-ratio telling us specifically? (And don’t say ‘whether to reject Ho)

Your company offers a denied-benefit pension plan to each of its employees. The plan will make a monthly payment to each retiree of $4 thousand, next month. In each subsequent month, the payment will grow by an annualized rate of 2% to adjust for inflation. There are currently 100 retirees, and you estimate that this number will remain the same, indefinitely. The government mandates that (i) pension liabilities must be discounted at an annualized rate of 4%, and (ii) pension liabilities must be 75% funded (that is, the pension fund must be funded at 75% of the present value of the liabilities). (a) How much money must your rm contribute to its pension fund. (b) Consider the following variation on (a). Yours is a young company { a sexy startup. You don't have any retirees right now, but you do make pension promises to your young workers. You estimate that 20 years from now the first cohort of 50 workers will retire, receiving their first monthly payment one month after retiring (received in 241 months). Going forward, you expect the pool of retirees to remain stable, at 50. How much money must your firm contribute now in order to fulfil the government mandate?

Read the following text and apply at least 3 guidelines for judging whether the observed association is causal to answer question.

Attention-deficit/hyperactivity disorder (ADHD) is the most common neurodevelopmental disorder and is associated with significant burden. More than half of children with ADHD continue to have this disorder in adulthood and live with many long-term adverse health and social conditions. The worldwide ADHD prevalence in children has been estimated at 7.2%. Genetic factors have been demonstrated to play a role in ADHD etiology with a heritability of 70%-80%. Other factors that play a role include low level of paternal education, low maternal age at delivery, prenatal smoking, prenatal illicit drug use, birth complications, low birth weight, preterm delivery, neonatal jaundice, childhood asthma, maternal depression, use of prenatal antidepressants and acetaminophen exposure. It has been demonstrated that exposure to antibiotics in early life disrupts the equilibrium of gut microbiota and could potentially contribute to the development of ADHD. In a population-based cohort study, researchers found that early antibiotic exposure was associated with the development of ADHD (RR=1.10, 95% Confidence interval 1.01, 1.65).

Is the association between early antibiotic exposure and ADHD causal?

Background: Despite their antimicrobial potential, vaginal lactobacilli often fail to retain dominance, resulting in overgrowth of the vgna by other bacteria, as observed with bacterial vaginosis. It remains elusive however to what extent interindividual differences in vaginal Lactobacillus community composition determine the stability of this microflora. In a prospective cohort of pregnant women we studied the stability of the normal vaginal microflora (VMF) (assessed on Gram stain) as a function of the presence of the vaginal Lactobacillus index species (determined through culture and molecular analysis with tRFLP).

Results: From 100 consecutive Caucasian women vaginal swabs were obtained at mean gestational ages of 8.6 (SD 1.4), 21.2 (SD 1.3), and 32.4 (SD 1.7) weeks, respectively. Based on Gram stain, 77 women had normal or Lactobacillus-dominated vaginal microflora (VMF) during the first trimester of which 56 remained normail in the third trimester. Th3 remaining 23 women tested abnormal in the first trimester and 13 of them converted in the second or third trimester.

Test the null hypothesis that having an abnormal result in the first trimester is related to having an abnormal result in the third trimester (Hint: What type of chi-square test is this?). (5 pts).

Did I answer these correctly? Too many true answers based on my research. Uncertain about 1, 2 and 2

1) __T__ An association not explained by bias, chance, confounding means an association is causal.

2) __T__ The connection among intention, decision, behavior, and outcome is not always clear.

3) __T__ Positive predictive value is more influenced by the sensitivity than the specificity of the screening test.

4) __T__ Specificity answers the question: “Of all individuals that were free of disease A, what proportion tested negative?”

5) __T__ Successful treatment programs that shorten the duration of a disease primarily affect the prevalence of the disease rather than the incidence rate.

6) __T_ The preclinical phase of disease lasts from the biological onset to the development of symptoms.

7) __T__ Incidence rate is a true rate because the denominator is defined in terms of person-time whereas cumulative incidence is a proportion.

8) __T__ A clinical trial entails comparing a group of patients treated with a test treatment to a comparable group of patients receiving a control treatment.

9) __F__ Experimental study designs have lower validity than cohort studies.

10) _T__ A “gold standard” is used to determine whether a screening test is effective.

15/ 365 Preterm baby

BW: 2100g

GA: 33rd week

Calculate all requirements and prepare the exchange list, and the diet list.

“The List”---the list of services and products that are provided to all people “free” at the point of sale by our government and our society, with the costs paid for by taxation---income taxes, sales taxes, property taxes, special taxes on alcohol, tobacco, gasoline, and other taxes….   1. IN YOUR OPINION, which service or product on The List is the MOST important? Why? 2. Which service or product is the LEAST important? Why? 3. WHAT ONE SERVICE OR PRODUCT WOULD YOU ADD TO THE LIST? WHY? Why did you choose this service or product over all other possible choices? 4. Has the pandemic played a role in your answer to #3.? Why or why not?

Write a program in python such that There exists a list of emails List Ls = ['[email protected]','[email protected]','[email protected]','[email protected]',[email protected]']

Count the number of emails IDS which ends in "ac.in"

Write proper program with proper function accepting the argument list of emails and function should print the number of email IDs and also the email IDS ending with ac.in

output

2

[email protected]

[email protected]

=================================

i am trying like this but getting confused

len [True for x in Ls if x.endswith('.ac.in')]

please write complete progam and show output and also explain the solution