3.) The percentage of metal alloy used in metal casting is measured in 41 random selected parts. The sample standard deviation is s=0.42. Construct a 95% two-sided confidence interval for ό (variance)
Q: A metal bolt is to be inserted into a hole. A random sample of n = 16 parts is selected, and the…
A:
Q: The average baptismal cost includes 50 guests. A random sample of 32 baptismal during the past year…
A: Given n=32 x¯=53s=10α=0.05
Q: ) Soil has been improved to increase the strength of a ground. The average compressive strength of…
A: Ho: the improvement application changes the standard deviation of the soil strength at the 5%…
Q: It is known that the average weight of the products produced in a factory is 150 grams. The shape of…
A:
Q: How large a sample is required to estimate the mean speed of all cars travelling on the high way…
A:
Q: In recent days online version of different toys are receiving popularity among the customers.…
A:
Q: When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A…
A: Given, Sample size = 40 Sample mean = 172.5 Population standard deviation = 119.5 Under the…
Q: The variability of oil prices per barrel has been very stable for the past 26 weeks. You would like…
A: State the hypotheses. That is, there is no evidence that the gas prices variability has changed.…
Q: The burning rates of two different solid-fuel propellants used in air crew escape systems are being…
A: We have to find the significance of mean, confidence interval and find whether p value is greater or…
Q: The telecommunications manager at Lowell Call Center is concerned about the average difference in…
A: Given that, The telecommunications manager at Lowell Call Center is concerned about the average…
Q: A recent research study reported that the mean daily internet usage among preparatory school…
A: From the provided information, Sample size (n) = 22 Sample mean (x̄) = 125 Sample standard deviation…
Q: 5. An experiment was conducted to compare the vinegar content of salad dressing on two different…
A: Given: Sample size = n1 = n2 = 10 Sample variance s12=2.0 Sample variance s22=0.4 Confidence level…
Q: 4) At one college, GPA's are normally distributed with a mean of 2.9 and a standard deviation of…
A:
Q: It is desired to determine whether there is a less variability in the mutriation in the health…
A: An F-test for equality of variances is a hypothesis test that is used to assess whether two…
Q: campers were considered and their scores were recorded. We are using a 0.05 significance level to…
A:
Q: An experiment is replicated to determine the variation in temperature for which a certain process…
A: Formula for the confidence interval for a variance is, (n-1)s2χα/2, n-12 < σ2 <…
Q: Average SHS annual cost of tuition fee for all private school last year was 46,300. A random sample…
A: The provided information are: Sample size(n) =45Sample meanx¯=47800Sample standard deviation(s)=5600
Q: Assuming that the populations are normally distributed and the population standard deviations are…
A: A researcher is interested in comparing the resting pulse rate of people who exercise regularly and…
Q: A special cable has a mean breaking strength of 1131 pounds. The standard deviation of the…
A: Given, Sample size = 40 Sample mean = 931 Population standard deviation = 333 Under the claim, the…
Q: The percentage of metal alloy used in metal casting is measured in 41 random selected parts. The…
A: Given information- Sample size n = 41 Sample standard deviation s = 0.42 Confidence level = 0.95…
Q: The sample mean weight of 65 adult African elephants was measured to be 14,325.62 pounds, with a…
A: Solution : Given : n= 65, X¯ = 14325.62 pounds, σ = 872.71 pounds , α = 0.10 Let us define , H0 : μ…
Q: A survey found that women's heights are normally distributed with mean 62.2in. and standard…
A: Men mean =67.7 s = 3.5
Q: What are the cutoff numbers for the number of chocolate chips in acceptable cookies?
A: Let X be the random variable for the number of chocolate chips in a popular brand. X ~ N(μ=23,σ=1.3)…
Q: A survey was conducted to determine the average number of hours that people spend on the internet…
A: GivenMean(x)=3standard deviation(s)=1sample size(n)=100significance level(α)=0.05
Q: The mean breaking strength of cables supplied by a manufacturer is 1900 n/m? with a standard…
A:
Q: The finish times for women in the 25-29 age group of the Hermosa Beach Triathlon in California are…
A: a).Given, For women, μw=5261σw=807 For men, μm=4313σm=583 Using empirical rule, the required middle…
Q: n a scientific study conducted by the Dax Science Lab on Deep Space Nine, 41 male rats were sent to…
A:
Q: Suppose the speeds of vehicles traveling on a highway are normally distributed. If the population…
A: Introduction:The 90% confidence interval for the population mean for given population standard…
Q: The sample mean weight of 200 adult vulturine parrots was measured to be 734.2 grams, with a…
A: Given x bar = 734.2s = 15.7n = 20 The 90% CI is given by
Q: The number of chocolate chips in a popular brand of cookie is normally distributed with a mean of 21…
A:
Q: The most commonly encountered/used measure of vairablity is the ? Standard deviation Mean Mode…
A: The most commonly used measure of variability from given options are Standard deviation Mean Mode…
Q: Construct a confidence interval for the population variance o^2 and the population standard…
A: Let be the population variance.Let be the population standard deviation.Given that,Sample size…
Q: In a one-way ANOVA, what does Eta-squared mean? 1, it is the squared F-ratio 2. it is the…
A: Using Eta-square we measure effect size. Eta-squared is used to calculate proportion of variability…
Q: What is the typical age of a person who renews his or her driver’s license online? From a random…
A: Solution: Let X be the age of online renewal users. From the given information, x-bar=42.6, S=5.4…
Q: In a simple random sample of 100 electronic components products by a certain method the mean…
A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…
Q: Traffic Highway planners investigated the relationshipbetween traffic Density (number of automobiles…
A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…
Q: The mean number of the sample of 16 bolts produced on a specific machine per day was found to be 42…
A: Given: Size of sample =16 bolts sample mean = 42 sample standard deviation =2. Population is…
Q: If the variance of the civil Engineering board examination result is 81, what is the minimum number…
A:
Q: A random sample of 100 pumpkins is obtained and the mean circumferenceis found to be 40.5 cm and…
A: From the provided information, The hypotheses can be constructed as follow: Null hypothesis: H0: µ =…
Q: ) Soil has been improved to increase the strength of a ground. The average compressive strength of…
A: F test is used to test the equality of two population variances . From the above question we are…
3.) The percentage of metal alloy used in metal casting is measured in 41 random selected parts. The sample standard deviation is s=0.42. Construct a 95% two-sided confidence interval for ό (variance)
Step by step
Solved in 2 steps with 5 images
- 5) A sample of 400 male students is found to have a mean height (55 + 18) inches. Can it be reasonably regarded as a sample from a large population with mean height 66 inches and standard deviation 1.30 inches? Test at 5% level of significance.poll used a sample of 100 randomly selected car owners. Within the sample, the mean time of ownership for a single car was 7.18 years with a standard deviation of 3.37 years. Test the claim by the owner of a large dealership that the mean time of ownership for all cars is less than 7.5 years. Use a 0.05 significance level. Find the Z score and P value and if left-tailed or right-tailed. Also to reject or not too.In a construction site wheelbarrow is loaded by a worker. The total weight after loading of barrowand the loading time is recorded for ten of the cycles in a day randomly.a) Find the correlation coefficient between the time and weight of wheelbarrow.Sample variance of loading time is 303.29Sample variance of the weight is 272.78b) Assume that the loading time is normally distributed. Please find the mean of loading time with99% confidence interval using t distribution. Time to Load(s) Weight of Wheelbarrow(kg)172 76173 83179 95171 84193 94193 106156 60158 70188 90139 53
- The Sunny Dale Bank monitors the time required to serve customers at the drive-through window because it is an important quality factor in competing with other banks in the city. After analyzing the data gathered in an extensive study of the window operation, bank management determined that the mean time to process a customer at the peak demand period is 5 minutes, with a standard deviation of 1.5 minutes. Management wants to monitor the mean time to process a customer by periodically using a sample size of six customers. Assume that the process variability is in statistical control. Design an x-chart that has a type I error of 5 percent. That is, set the control limits so that there is a 2.5 percent chance a sample result will fall below the LCL and a 2.5 percent chance that a sample result will fall above the UCL. After several weeks of sampling, two successive samples came in at 3.70 and 3.68 minutes, respectively. Is the customer service process in statistical control?Independent random samples of patients who had received knee and hip replacement were asked to assess the quality of service on a scale from 1 (low) to 7 (high). For a sample of 83 knee patients, the mean rating was 6.543 and the sample standard deviation was 0.649. For a sample of 54 hip patients, the mean rating was 6.733 and the sample standard deviation was 0.425. Test, against a two-sided alternative, the null hypothesis that the population mean ratings for these two types of patients are the same.A study was performed concerning risk factors for carotid-artery stenosis (arterial narrowing) among 264 men. The data reported is: Sample size Mean Standard deviationGroup 1: No stenosis 156 5.3 1.4Group 2: Stenosis 108 5.1 0.8 The test stastistic F is assumed to be 3.06 to check the equal variance. Question: Suppose researchers want to test if there is a significant difference in mean blood-glucose level between men with and without stenosis considering the critical F test is 1.35 with a equal variance (pooled), what is the test statistic for this test ?
- A random sample of 100 private companies locating in Ankara was asked to rate on a scale from 1 (not important) to 5 (extremely important) for having the practical knowledge of statistics as a good job candidate. The sample mean rating was 4.7. a)Test at the 5% significance level the null hypothesis that the population mean rating is less than or equal to 4.5 against the alternative that it is greater than 4.5. Population variance is known as 0.6. b)Compute p-value and explain what the calculated p-value means.find and interpret the z-score for the darta value given/ the value 250 in a dataset with mean 208 amd standard deviation 21.A manufacturer’s process for analyzing aspirin tablets has a known variance of 25. A sample of ten aspirin tablets is selected and analyzed for the amount of aspirin, yielding the following results: 254, 249, 252, 252, 249, 249, 250, 247, 251, and 252. Determine whether there is any evidence that the measurement process is not under statistical control at a = 0.05.'
- The breaking force of the cables produced by a manufacturer is 1800 lbs (lb) and the standard deviation is 100 lbs. It is claimed that the breaking force can be increased with a new technique in the manufacturing process. To test this claim, a sample of 50 wires is taken and tested. The average breaking force of the samples is found as 1850 lb. Can we support this claim at the 0.01 significance level?The barricade width of 25 glass 2-liter bottle was measured by an independent quality control engineer from Zimbabwe. The sample mean was 4.05 meters and sample standard deviation was 0.08 meter. Find a 95% lower confidence bound for mean barricade width.