In a national survey, middle school students report spending 3.1 hours per week on homework. Mr. Jones suspects that his students study more than the national average. What are Mr. Jones's null and alternative hypotheses? O Ho≤ 3.1; HA : μ> 3.1 O H: 23.1; HA<3.1 Ho≤3.1; HA: > 3.1 Η : μ 2 3.1; Η, :μ < 31
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In a national survey, middle school students report spending 3.1 hours per week on homework. Mr. Jones suspects that his students study more than the national average. What are Mr. Jones’s null and alternative hypotheses?
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- QUESTION 15 Suppose that if the null that alpha and beta both equal one is true a tost statistic you have calculated s dnitributed as an Fstatistic with 3 and 30 degroes of freedom for the numerator and denominator respectivoly What critical value cuts off 5% of the upper tal of this disitritution? OA.5.168 O B.9 277 OC8617 O D. None of the aboveADVERSE SELECTIONSomet Health Insurance Company wants to sell a health insurance product for $700 permonth. There is no requirement for healthy people to have insurance coverage. Thecompany conducts a survey to see how different populations respond to the proposed cost.People with no illnesses and disabilities, generally the young and healthy, respond that theydo not spend $700 on healthcare in an entire year, and most feel they would not waste somuch money on premiums when the chance of needing surgery or expensive healthcaretreatments is so small. However, older, sicker people think that $700 per month is a greatdeal, as most of them spend far in excess of this amount on healthcare. It seems like agreat deal for them. What will happen to the costs of the health insurance if only the older, sicker peopleenroll?In 2009 the Organization for Economic Cooperation andDevelopment (OECD) conducted a study of 34 membercountries called the Programme for International StudentAssessment (PISA). The OECD looked at reading scores among 15-year-olds in each country as well as the stu-dents’ socioeconomic backgrounds. PISA reported that higher socioeconomic status was associated with higher reading scores, with their socioeconomic index explain-ing 14% of the variability in reading scores. (Source: Sahlberg, Pasi, “A Model Lesson: FinlandShows Us What Equal Opportunity Looks Like,”American Educator Spring 2012: 25.)Which of the following can be correctly concluded fromthis information?A) For every additional point in the mean reading scorein an OECD country, the PISA socioeconomic indexis expected to increase by 14% on average.B) For every additional one percent increase in the PISAsocioeconomic index, the mean reading score isexpected to increase by 14% on average.C) If the U.S. government wants to…
- 1. Why is the existence of a correlation (existence of co-occurrence or association) between and Fnot enough evidencefor us to say that Ycauses Y?2. What is the post hoc, ergo propter hoc fallacy? Give an example18:23 : (C. a. Show that E(Y₂) = E(Y₁-1). (Hint: Read Key Concept 14.5.) b. Show that E(Y) = Bo/(1 − B₁). 14.1 Consider the AR(1) model Y₁ = B₁ + B₁Y₁-1 + U₁. Suppose that the pro- cess is stationary. 35 14.5 Prove the following results about conditional means, forecasts, and forecast errors: a. Let W be a random variable with mean µw and variance o and let c be a constant. Show that E[(W − c)²] = σ² + (µw − c)². b. Consider the problem of forecasting Y₁, using data on Y₁-1, Y₁-2, . . . . Let fi-1 denote some forecast of Y₁, where the subscript t - 1 on ft-1 indicates that the forecast is a function of data through date t 1. Let E[(Y₁-ft-1)² Y₁-1, Y₁-2,...] be the conditional mean squared error of the forecast fi-1, conditional on values of Y observed through date t 1. Show that the conditional mean squared forecast error is mini- mized when fi-1 = Y-1, where Y₁-1 = E(Y₁|Y₁-1,Y₁-2, ...). (Hint: Review Exercise 2.27.) c. Let u, denote the error in Equation (14.13). Show that cov(u₁,…a. b. Given the equation, L = 2r + 3k + 8(q-¹/2k¹/2) dL/dr = ? dL/dk = ?
- 100kl – 5k²1² + 2k + 4l TT = dl dk and dn dn Find dk = 100 – 10kl + and dn dl = 100 – 10lk² dn dk = 1001 – 10kl² + 2 and dn dl = 100k – 10lk² + 4 dn dk = 100 – 10kl2 + 2 and dn dl = 100 – 10lk² + 4 dnPisa Pizza, a seller of frozen pizza, is considering introducting a healthier version of its pizza that will be low in cholesterol and contain no trans fats. The firm expects that sales of new pizza will be $20 million per year. While many of these sales will be to new customers, Pisa Pizza estimaes that 40% will come from customers who switch to the new, healthier pizzai nstead of buying the original version. a) Assume cusotmer will spend the same amount on either version. What level of incremental sales is associated with introducing the new pizza? b) Suppose that 50% of hte cusomters who will switch from Pisa Pizza's orignial pizza to its healthier pizza will switch to another brand if Pisa PIzza does not introduce a healthier pizza. What level of incremental sales is associated with introducing the new pizza in this case?Either all or none... Asap plxxx
- ← The worldwide market share for a web browser was 20.2% in a recent month. Suppose that a sample of 120 random students at a certain university finds that 30 use the browser. Complete parts (a) through (d) below. a. At the 0.05 level of significance, is there evidence that the market share for the web browser at the university is greater than the worldwide market share of 20.2%? Determine the null and alternative hypotheses. OA. Ho: x=0.202; H₁: *#0.202 B. Haizz0.202; H:a 0.202 Calculate the test statistic. ZSTAT (Type an integer or a decimal. Round to two decimal places as needed.) =A counselor claims that a new method of conflict resolution is less prone to interruption than an old method. Prior experience suggest that clients interrupted each other average of an 10 times per session. A drug company claims that a single dose of a new drug relieves symptoms for a longer period of time than the current formulation. The current formu- lation relieves symptoms for eight hours, on average. Americans gain an average of one pound per year as they age between the ages of 25 and 45. A public health campaign aims to decrease the amount of weight gained during this interval.xt:Bong-Cha is deciding what to do during the 30-minute break between her college classes. One rule she could follow is, "Choose the activity with the highest value" (A). Another rule she could follow is, "Choose the activity with the lowest opportunity cost" (B). Do you think Bong-Cha's choice if she follows rule (A) will be the same as the choice she would make if she followed rule (B)? [another way to think about it, "Is rule (A) identical to rule (B) in a sense that they would both induce the same choice?"].