What is the P(t < -1.2) with a sample size of 12. 2. What is the P(−2.4
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1. What is the P(t < -1.2) with a
2. What is the P(−2.4<t<2.4)P(-2.4<t<2.4) with a sample size of 15.
(1)
Sample size (n) = 12
P(t<-1.2)
The degree of freedom is:
Step by step
Solved in 4 steps
- FOR SAMPLE Mean = (62.5*1+62.75*1+63*2+63.25*3+63.5*4+63.75*4+64*5+64.25*4+64.5*4+64.75*3+65*2+65.25*1+65.5*1)/35 = 64 E(X2) =(62.52*1+62.752*1+632*2+63.252*3+63.52*4+63.752*4+642*5+64.252*4+64.52*4+64.752*3+652*2+65.252*1+65.52*1)/35 = 4096.5 Standard deviation =√4096.5-(64^2) = √0.5 = 0.707106 or 0.71 FOR POPULATION mean mean= 61.56 Standard deviation =√ 3798.4-(61.56^2) = 2.9608 Activity: Find the best point estimate of the population mean.Q1. An anthropologist wants to collect data to determine whether the two different cultural groups that occupy an isolated Pacific Island grow to be different heights. The results of his samples of the heights of adult females are as follows Group A n = 120 X,= 62.7 Group B n = 150 X, = 61.8 S1= 2.5 S2 = 2.62 Do these samples constitute enough evidence to reject the null hypothesis that the heights of the two groups are the same? Set alpha to .05. What are the appropriate null and alternative hypothesis? A. Ho: H1- H2 = 0 H;: H1 - H2 * 0 B. Ho: H1- H2 N0 H: H-H2 0 D. Ho: H1 - H2 # 0 H: H- H2 = 0 E. None of these. 2. What is the Test statistics? A.T = X-9-Do B. Z = -9-Do C. T = -9-Do D-Do D.T = E. Z = -9-Do 1, 1 SD 1 ni'n2 n1 n2 zu Tu 3. What is the value of the test statistic? A. T = 9.20 B.T = 2.86 C.Z = 9.20 D.T = 1.44 E.None of these A TOSHIBA F6 F10 F11 F12 SNI YJUQ1. An anthropologist wants to collect data to determine whether the two different cultural groups that occupy an isolated Pacific Island grow to be different heights. The results of his samples of the heights of adult females are as follows Group A n = 120 X1= 62.7 Group B n = 150 X2 = 61.8 S2 = 2.62 S1=2.5 Do these samples constitute enough evidence to reject the null hypothesis that the heights of the two groups are the same? Set alpha to .05. 5. What is the appropriate decision and conclusion? A. Reject Ho, so there is significance evidence to conclude heights of the two groups are different. B. Fail to eject Ho, so no significance evidence to conclude heights of the two groups are different. C. Fail to reject Ho, so there significance evidence to conclude: heights of the two groups are different D. Reject Ho, so no significance evidence to conclude heights of the two groups are different.
- 79. What is the 90% confidence interval for the difference in population proportions, p1 – p2 , given the following sample data: [-0.0772 , 0.1172] [-0.0499 . 0.0899] [-0.0710 , 0.1110] [-0.0603 , 0.1003]R4Q2. A laundry for car wash found that the average, for small size car, cleaning time is 5 mins in the morning and 6.5 mins at evening time when a sample of size 30 is taken at the two time periods. From the previous record, the laundry manager knew that car oj = 2 mins for the morning shift and oz = 2.5 mins for morning and evening repectively. Find the interval estimate for 4 - 42 with 90% confidence level.
- In a one - sample t-test, the results are as follows: t(31) = -3.41, p <0.01. How many data points were there in the analysis that produced this result? 30 31 32 O 297.Statistics QuizTo better understand how husbands and wives feel about their finances, Money Magazine conducted a national poll of 1010 married adults age 25 and older with household incomes of $50,000 or more (Money Magazine website, December 14, 2014). Consider the following example set of responses to the question, “Who is better at getting deals?” Who Is Better? Respondent I Am My Spouse We Are Equal Husband 278 127 102 Wife 290 111 102 Develop a joint probability table and use it to answer the following questions. Construct the marginal probabilities for Who Is Better (I Am, My Spouse, We Are Equal). Comment. Given that the respondent is a husband, what is the probability that he feels he is better at getting deals than his wife? Given that the respondent is a wife, what is the probability that she feels she is better at getting deals than her husband? Given a response “My spouse” is better…
- 19 Consider the middle interval in the sampling distribution of ?̅: 0.430 0.500 where ?̅ is obesity rate in the random samples of adult males in the age group 50-59. Given α = 0.05, what is the sample size ? in this sampling distribution? a 895 b 836 c 781 d 730Compute for the mean (??̅) and standard deviation (??̅) of the sampling distribution of the sample means and compare these to the mean and standard deviation of the population.4 In the case of one sample hypothesis, if z = -1.85, sign of H1 is <; thus, P-value equals: (Write 4 decimal places) Answer:
