On the basis of extensive tests, the yield point of a particular type of mild steel-reinforcing bar is known to be normally distributed with (a) Assuming this to be the case, if a sample of 25 modified bars resulted in a sample average yield point of 8435 lb, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) 8383.60 x 8486.40 xlb 100. The composition of the bar has been slightly modified, but the modification is not believed to have affected either the normality or the value of 0.
Q: Periodically, the county Water Department tests the drinking water of homeowners for contminants…
A: (a) The 99% confidence interval for the mean lead level in water specimens of the sub development is…
Q: pA report gives the following observed trequencies : N= 1,000, (A) = 510, (B) = 490, (C) = 427, (AB)…
A:
Q: A level with a collimation error of 0.00008 ft/ft is used in leveling a line that has a sum of 525…
A: Given Information:Collimation error =0.00008ft/ftBacksight distances sum =525ftForesight distances…
Q: uncarne dirrerent from the mean amount of airborne bacteria in uncarpeted rooms. To test this,…
A:
Q: Q10.1
A: a) mean for no fast food = 1853.2 mean for fast food = 1790.1b) standard deviation for no fast food…
Q: Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 35 of the…
A: Given information
Q: feels that the commute in his city is less and wants to publicize this. He randomly selects 25…
A: The hypotheses are given as follows: Null hypothesis: µ=25.4. Alternative hypothesis: µ<25.4.…
Q: A production process is currently operating at + 4.5 a level. a. Calculate the nonconforming ratio…
A: Answer: Part A: --------------------------- Here, For a ± 4.5σ level, the 'z' score is 4.5.…
Q: To compare the effectiveness of competing fertilizers on increasing radish size, researchers…
A: Use the given data to form the excel table: Radish Fertiliser A x-μ x-μ2 1 1.4…
Q: (d) Which equation is used to find the sample size n for estimating μ when σ is known? On-(0)² On=…
A: d) standard deviation(σ)=7.40 Margin of error(E)=2.40 Confidence level=99%
Q: How Big Are Gribbles? Gribbles are small, pale white, marine worms that bore through wood. While…
A: Let μ and σ denote respectively the population mean and standard deviation of the length of…
Q: If the SST=746, the SSE=516, n=472 and the model of interest is y = Bo + B₁x₁ + B₂x12 + ß3x3 + B4X4…
A:
Q: a) find s^2 (and round it to two decimal places) b) construct a 95% interval for B1 c) construct…
A: (a) Use EXCEL to obtain the value of S2 EXCEL procedure: Go to EXCEL Go to Data>Data…
Q: An abrasion test was performed using n = 14 moulded ceramic pieces. The following are the test…
A: Given the result of a performed an abrasion test using moulded ceramic pieces:(Survived,8),…
Q: How sensitive to changes in water temperature are coral reefs? To find out, scientists examined data…
A: (b). Consider that X and Y are defined as Sea surface temperature and Growth, respectively.
Q: scatterplot
A: Given X: age in years Y: Canal length in millimeter Scatter Plot: It is a Graphical representation…
Q: Unfortunately, arsenic occurs naturally in some ground water.t A mean arsenic level of u= 8.0 parts…
A: We have given that Sample size n=36 ,xbar = 7.1 ,mu=8bbp ,s=2.2 and level of significance =0.01
Q: Consider the following table: Among Treatments Error Total SS ? DF 3997.41 13 MS 1123.41 239.5 F…
A: An incomplete ANOVA table is given.It is needed to find the sum of squares among treatments.
Q: None
A: Step 1:Given that Initial TCLP concentrations:6.1, 4.2, 5.8, 6.5 true population mean is 95% The…
Q: Given the data points (2, 29.5), (5, 523), (7, 1807), and (11, 9853), find the value of f(x) if x =…
A:
Q: To test whether the mean time needed to mix a batch of material is the same for machines produced by…
A: Manufacturer 1 2 3 20 29 15 26 27 14 24 32 18 22 28 17
Q: Consider the following table: Among Treatments Error Total SS DF 5 9059.37 17 MS 1122.69 287.16 F TI…
A:
Q: hat is the F-ratio? Please put the answer in bold.
A: Using Excel Software to obtain the ANOVA to the following data Brainmass in Brainmass gliaNeuro…
Q: Interpret the result of the estimated coefficients based
A: Given information: The output for multiple linear regression is given.
Q: D Question 5 Calculate the test statistic. Ot- 1.75 Ot-.0.9624
A: Given : n = 12 α = 0.05
Q: The American Mineralogist (Oct. 2009) published a study of the evolution of uranium minerals in the…
A: (b) The probability of X lies between 2 and 2.6 is, Therefore, the required probability is, 0.30
Q: a. Find E(x) and interpret its value. Select the correct answer below and fill in the answer box to…
A: Here X is uniformly distributed between 1 and 3
Q: route FT050 at Batu Pahat, Johor. Suggest how to qu the basic characteristic of this data. Then…
A: *Answer:
Q: www.. of this treatment were 11 patients whose melanoma had not responded to existing treatments,…
A: As the sample size is n=11 Adn we assume that the sample follows normal distribution. Option (ii) is…
Q: Q3. Calculate Estimated Standard error (S»)from the following data:_ 3 4 5 2 y 3 4 5
A: Regression: Regression is a technique that is used to determine relationship between two or more…
Q: Consider the following table: Among Treatments Error Total SS ? DF 5 9059.37 17 MS 1122.69 287.16 F…
A: Given table , We have to calculate the value of sum of squares among treatments () and the sum of…
Q: data suggest that the extra carbonation of cola results in a higher average compression strength? A
A: Given, Sample Size for Cola, n1 = 17 Sample mean for Cola, x1¯ = 554 Sample standard deviation for…
Q: A photoconductor film is manufactured at a nominal thickness of 25 mils. The pr increase the mean…
A: Solution: Given information: n1=8n2=8x1=1.15x2= 1.06s1=0.11s2= 0.09α=0.10
Q: A random sample of 12 song lengths (in minutes) on a playlist found: 278.3, s = 19. Build a 80% CI…
A: We have given that the random sample of size 12, sample mean 278.3 and standard deviation 19. The…
Q: A sample of blood pressure measurements is taken for a group of adults, and those values (mm Hg)…
A: Mean: For a set of n observations, x1, x2, ... , xn, mean is given by, Standard deviation: For a…
Q: The acceptable level for insect filth in a certain food item is 5 insect fragments (larvae, eggs,…
A:
Q: LFind the area of the following in percent (%). 1. z = 1.57 2. z = 2.81 3. From z = 1.0 to z= 3.02
A: Note: Please repost remaining questions and subparts as i can answer only 3 subparts of 1st question…
Q: Plot a calibration graph from the following data and determine the concentration of the unknown.…
A: Equation for line will be Y=44.13+0.0047(Peak area)-0.00725(Internal Standard peak area) Hence…
Q: (c) Assume th at the resist ance of a cert ain type of resistors is normally distributed with a mean…
A:
Q: Calculate Estimated Standard error (SE)from the following data: 3 4 5 2 1 y 3 4 5 6. 2.
A:
Q: A researcher found that the two groups (n=25 in each group) they tested were significantly different…
A: A researcher found that the two groups (n=25 in each group) they tested were significantly different…
Step by step
Solved in 2 steps with 2 images
- A large automobile insurance company selected samples of single and married male policyholders and recorded the number who made an insurance claim over the preceding three-year period. Single Policyholders Married Policyholders n1=550 n2=1,000 Number making claims = 110 Number making claims = 150 a. Use a=0.05 Test to determine whether the claim rates differ between single and married male policyholders. z-value (to 2 decimals) p-value (to 4 decimals) b. Provide a 95% confidence interval (to 4 decimals) for the difference between the proportions for the two populations. Enter negative answer as negative number. ( , )Fill the chi square for Cross 1 and Cross 2 from the following data in the attached image: Cross 1: Phenotypes Ratio Observed Expected (O-E)2/E Totals X2 = Cross 2: Phenotypes Ratio Observed Expected (O-E)2/E Totals X2 =The data below are the shoot lengths (cm.) of Robusta coffee seedlings as affected by different periods of storage. Find out if there are significant differences in the effects of different periods of storage on the shoot lengths. (Note: CRD experiment) Solve for the; a. F computed b. Coefficient of Variation (CV), C. Standard error of the treatment means (S), d. standard error of difference between treatments (Sd) e. Make a Decision Treatments Replications 11 11 P1 10.1 9.2 9.5 P2 9.5 9.3 8.5 P3 8.7 9.2 7.5 P4 6.7 6.2 5.0
- An article reported the following frequencies with which ethnic characters appeared in recorded commercials that aired on Philadelphia television stations. Ethnicity: Frequency: African American USE SALT Calculate th x² = | OHP₁ P₂P, P = 0.250 H₁: at least one p, = 0.25 Asian In a recent census, the proportions for these four ethnic groups are 0.177, 0.042, 0.734, and 0.047, respectively. Does the data suggest that the proportions in commercials are different from the census proportions? Carry out a test of appropriate hypotheses using a significance level of 0.01. (Let P P₂P and p be the population proportions of the four ethnic groups (African American, Asian, Caucasian, and Hispanic respectively) appearing in commercials on Philadelphia television stations.) State the appropriate hypotheses. O H₂: P₁ = 0.047, P₂ -0.011, p = 0.330, p = 0.005 H: at least one p, P Caucasian Hispanic 330 OH: P₁ = 0.120, P, = 0.028, p = 0.840, p = 0.013 H: at least one p, * P OH₂: P₁ = 0.177, P₂ = 0.042,…Please answer all 4Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 33 of the 38 subjects treated with echinacea developed rhinovirus infections. In a placebo group, 94 of the 111 subjects developed rhinovirus infections. Use a 0.01 significance level to test the claim that echinacea has an effect on rhinovirus infections. Complete parts (a) through (c) below. a. Test the claim using a hypothesis test. Consider the first sample to be the sample of subjects treated with echinacea and the second sample to be the sample of subjects treated with a placebo. What are the null and alternative hypotheses for the hypothesis test? O A. Ho: P1 #P2 Hy:P1 =P2 O B. Ho: P1 =P2 H1: P1 P2 H1: P1 #P2 Identify the test statistic. (Round to two decimal places as needed.) Identify the P-value. P-value = (Round to three decimal places as needed.) What is the conclusion based on the hypothesis test? the null hypothesis. There sufficient evidence to support the claim that echinacea…
- Average speed on a freeway is 80 mph. Among all vehicles 65% drive 8 miles above the speed limit of 70 mph. 34 What fraction drive within ± 5 mph from the mean speed? a 0.7327 b 0.6978 c 0.6646 d 0.6330Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a particular landscaping proposal is based on the number of plantings of trees, shrubs, and so on to be used for the project. For cost estimating purposes, managers use two hours of labor time for the planting of a medium-sized tree. Actual times from a sample of 10 plantings during the past month follow (times in hours). 2.4 t (to 3 decimals) 2.8 Select your answer - 2.2 Ho : μ Select your answer - 2 Ha - Select your answer - ✪ 2 b. Compute the sample mean. (to 2 decimals) c. Compute the sample standard deviation. (to 4 decimals) d. Find the test statistic and p-value. (Use Table 2 in Appendix B.) ✪ 2.7 1.7 1.5 With a 0.05 level of significance, test to see whether the mean tree-planting time differs from two hours. a. State the null and alternative hypotheses. 1.6 2.4 2.6 3.1 p-value e. What is your conclusion? We - Select your answer-reject the null hypothesis.…Answer all questions. Please do not copy from other posts:
- 10. 18.30 Temperatures are measured at various points on a heated plate (Table P18.30). Estimate the temperature at (a) x = 4, y = 3.2, and (b) x = 4.3, y = 2.7. TABLE P18.30 Temperature (°C) at various points on a square heated plate. x = 0 x = 2 y = 0 y 2 y = 4 y=6 y 8 100.00 85.00 70.00 55.00 40.00 90.00 64.49 48.90 38.78 35.00 x = 6 70.00 48.15 35.03 30.39 27.07 30.00 25.00 x = 4 80.00 53.50 38.43 x = 8 60.00 50.00 40.00 30.00 20.00Data consistent with summary quantities in the article "Effects of Fast-Food Consumption on Energy Intake and Diet Quality Among Children" on total calorie consumption on a particular day are given for a sample of children who did not eat fast food on that day and for a sample of children who did eat fast food on that day. Assume that it is reasonable to regard these samples as representative of the population of children in the United States. No Fast Food 2342 1929 1020 1741 1480 2064 2154 1992 1863 1788 1776 1838 1659 1517 2680 Fast Food 2522 1757 933 2327 2433 2266 2525 1194 889 1510 874 2206 1810 1249 2116 (a) Use the given information to estimate the mean calorie intake for children in the United States on a day when no fast food is consumed. (Give the answer to one decimal place.) 1856.2 (b) Use the given information to estimate the mean calorie intake for children in the United States on a day when fast food is consumed. (Give the answer to one decimal place.) 1774.1 (c) Use the…To test whether the mean time needed to mix a batch of material is the same for machines produced by three manufacturers, the Jacobs Chemical Company obtained the following data on the time (in minutes) needed to mix the material. Compute the values below (to 2 decimals, if necessary). Sum of Squares, Treatment Sum of Squares, Error a. Use these data to test whether the population mean times for mixing a batch of material differ for the three manufacturers. Use a = 0.05. Mean Squares, Treatment 0000 Mean Squares, Error Calculate the value of the test statistic (to 2 decimals). 1 17 23 21 19 What conclusion can you draw after carrying out this test? - Select your answer - Manufacturer 2 28 26 31 27 + 3 18 17 21 20 The p-value is - Select your answer - What is your conclusion? - Select your answer - b. At the a = 0.05 level of significance, use Fisher's LSD procedure to test for the equality of the means for manufacturers 1 and 3. Calculate Fisher's LSD Value (to 2 decimals).