A sample of 20 observations gave a standard deviation 3-72. Is this compatible with the hypothesis that the sample is from a normal population with variance 4-35 ?
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A: Given that, Sample size (n) = 25 Sample mean = 30 Sample variance = 49
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Q: The standard z-value of an arbitrary 16-unit sample from the normal-class population with a mean of…
A: Given Z=2 Mean=60, variance=100, sd=10, n=16 Z=(X-mean)/sd Z=(Xbar-mean)/sd/√n
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- suppose the number of off springs a female eagle raises during its lifetime has a disturibution mean 14 and variance 4.7 in an area, 45 rescued and cured female eagles are set free. if these eagles are assumed to be independent (no lack of male partners and food resources) the total number of off springs produced by these eagles can be assumed to have a normal distirubition with mean ...... and variance .... what will the values of mean and variance ?What source of variation is found in an ANOVA summary table for a within subjects design that is not in an ANOVA summary table for a between subjects design. What happens to this source of variation in a between-subjects design?A random sample of 23 bags of apples (marked as 10 pounds each) received by a large grocery chain tested out as having a mean of 9.2 pounds with a variance of 2.56 pounds. Test whether the true mean of all bags is under 10 pounds. Find the P-Value
- Suppose that hemoglobin levels in white males over age 11 are normally distributed with variance 1.462 and that those for white males age 11 or under are normally distributed with variance 0.867. Independent random samples of 10 older and 20 younger white males are selected and produce sample means of 13.47 g per 100 ml and 12.64 g per 100 ml, respectively. Do the data indicate that older white males have higher hemoglobin levels than younger white males? Use a 0.01 level of significance.Two suppliers manufacture a plastic gear used in a laser printer. The impact strength of these gears measured in foot-pounds is an important characteristic. A random sample of 10 gears from supplier 1 results in X₁ = : 290 and $₁ = 12, and another random sample of 16 gears from the second supplier results in x₂ = 321 and 5₂ = = 22. Is there evidence to support the claim that supplier 2 provides gears with higher mean impact strength? Use a = 0.05, and assume that both populations are normally distributed but the variances are not equal. a. Because -4.64 < -1.714, fail to reject the Null Hypothesis b. Because -4.64 < -1.714, reject the Null Hypothesis c. None among the choices d. Reject the Null HypothesisThe stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD (Evans et al., 2001). To demonstratethe effectiveness of the drug, a researcher selects asample of n = 20 children diagnosed with the disorderand measures each child’s attention span before and after taking the drug. The data show an average increaseof attention span of MD = 4.8 minutes with a varianceof s2 = 125 for the sample of difference scores.a. Is this result sufficient to conclude that Ritalinsignificantly improves attention span? Use a onetailed test with a = .05.b. Compute the 80% confidence interval for the meanchange in attention span for the population.
- 9. 32 students from Batangas National High school shows a mean IQ of 111 while 30 students from Batangas State University Integrated School were found to have a mean IQ of 115. Variance is equal to 64 and 78, respectively. Is there a significant difference between their IQ's? Use a 0.025 level of significance.Suppose a borderline hypertensive is defined as a person whose DBP is between 90 and 95 mm Hg inclusive, and the subjects are 35-44-year-old males whose BP is normally distributed with mean 80 and variance 144. What is the probability that a randomly selected person from this population will be a borderline hypertensive?a sample of 9 days over the past six months showed that a dentist treated the following numbers of patients: 22, 25, 20, 18, 15, 22, 24, 19, and 26. if the number of patientsseen per day is normally distributed, would an analysis of these sample data reject thehypothesis that the variance in the number of patients seen per day is equal to 10? use a.10 level of significance. what is your conclusion?
- 32 students from Batangas National High school shows a mean 1Q of 111 while 30 students from Batangas State University Integrated School were found to have a mean IQ of 115. Variance is equal to 64 and 78, respectively. Is there a significant difference between their 1Q'$? Use a 0.025 level of significance.An article in Knee Surgery Sports Traumatology, Arthroscopy, "Effect of provider volume on resource utilization for surgical procedures," (2005, Vol. 13, pp. 273-279) showed a mean time of 116 minutes and a standard deviation of 18 minutes for ACL reconstruction surgery for high-volume hospitals (with more than 300 such surgeries per year). If a high-volume hospital needs to schedule 10 surgeries, what is the mean and variance of the total time to complete these surgeries? Assume the times of the surgeries are independent and normally distributed. Mean = i Variance = i minutes minutes²A research assigns 21 adolescents to rate the likability of a person described in a vignette in hqvinf one of three personality traits. An equal number of participents are assigned to each group. If Fobt = 4.08 for this study, then what was the deciscion at a .05 level of significance for a one-way between subjects ANOVA?