Arkadaşlar istatistik dersi ile ilgli çözülmesi gereken 4 adet sorum bulunmakta. üniversite 2. sınıf dersi 6. ya alıorm.. şu soruları biri çözüp yardım etsede dersi geçsem.. yapabileceklere özelden salıım soruları. teşkkürlet

eyvallah 1) (30 pts) The student government at a university conducted a sample survey to determine student opinion on a proposed new constitution. The result of the survey are summarized below. Is there a significant dependence at the α=0,05 level between the classes and approval of proposal? Freshmen Sophomores Juniors Seniors Total Approve 40 30 30 20 120 Disapprove 30 30 20 30 110 Total 70 60 50 50 230 a) (5 pts) State the hypothesis b) (20 pts) Compute the test statistic c) (2,5 pts) State the decision

3) (20 pts) Manager of a company proposed a regression model to predict the satisfaction of their customers. A survey was conducted to a sample of 200 customers and the results of the survey is given in the below table. Use α=0,05 Dependent Variable: Satisfaction Independent Variables β coef. t p R R F p Constant 1,570 3,180 0,003 Empathy 0,556 5,305 0,000 Responsiveness 0,294 6,424 0,000 Trust 0,191 4,590 0,000 0,724 0,5258 1,676 0,000 Empathy x Trust 0,143 3,575 0,000 Gender (1=F;0=M) 0,399 2,516 0,012 a) (2,5 pts) Hypothesize the model b) (2,5 pts) Write the least squares prediction equation c) (5 pts) Assess the model adequacy d) (5 pts) Assess the adequacy of coefficients e) (5 pts) What is the satisfaction level of a male customer with empathy level of 5.0, responsiveness level of 4.3 and trust level of 3.8?

İnşallah bu sefer geçersin, soruları buradan paylaşın da bakacak olanlar, konulardan anlayanlar yardımcı olsunlar... Birlikten kuvvet doğar.

2) (15 pts) A sample of 12 homes sold last week is selected. Can we conclude that as the size of the home increases the selling price also increases? Use α=0,05 R R Square Adjusted R Square Std. Error of the Estimate 0,307 0,094 0,004 15,685, Sum of Squares df Mean Square F Sig. Regression 256,41 1 256,410 1,042 0,331 Residual 2460,256 10 246,026 Total0 2716,667 11 Unstandardized Coefficient Standardized Coefficient t Sig. B Std. Error Beta 67,179 29,237 2,298 0,044 X 25,641 25,116 0,307 1,021 0,331 a) (2,5 pts) Hypothesize the model b) (2,5 pts) Estimate the β s c) (2,5 pts) Assess the model adequency d) (5 pts) If you plan to buy a house of size 0,7 what would you expect its price be?