an elementary class consists of 8 boys and 10 girls. a child is chosen at random and it is a girl. a second child is randomly chosen again from the remaining children annd it is a boy. was the probably of choosing the boy dependent on choosing the girl first? explain
Identify Population Parameters From Sample Statistics Prompt: The owners of a small mail order business want to estimate their average annual sales. They randomly select 100 sales from their first quarter to analyze. For the samples, the average amount spent was $235.12 with a standard error of $12.41. Use what you have learned about sampling distributions to answer the following questions. Response Parameters What conditions, or assumptions, should be verified before using the sample values to estimate the population mean? If these conditions are satisfied, what is the probability that you would get a sample with a sample mean of $230.00 or less? If they expect to have 50,000 sales this year, what is their expected value of the total sales for the year? What do the following two values represent, in terms of the sampling distribution? X+Z0.05•?/?n =$214.77? X+Z0.95•?/?n =$255.47 What do these values mean in terms of the expected total sales for the year? Need completed in 4 hours or less only serious inquaries No plagiarism!!! The attached example is the format to complete the prompt
The standard deviation of sample means is the same as the population standard deviation. The distribution of sample means (x-bar values) for large random samples follows a bell-shaped curve only if the individual population values follow a normal distribution. (Hint: see the “Conditions for the Rule for Sample Means”). “A 95% confidence interval for the mean weight loss for men is 6.4 to 11.2 pounds.” This means that 95% of all men will lose between 6.4 and 11.2 pounds. If a 95% confidence interval calculated for the difference between two population means is –4.31 to 0.76, then we may conclude with high confidence that the two population means have different values. The weights for a population of North American raccoons has a bell-shaped frequency curve with a mean of about 12 pounds and a standard deviation of about 2.5 pounds. About 95% of the weights for individual raccoons in this population fall between what two values? The weights for a population of North American raccoons has a bell-shaped frequency curve with a mean of about 12 pounds and a standard deviation of about 2.5 pounds. About 95% of the weights for individual raccoons in this population fall between what two values? The weights for a population of North American raccoons has a bell-shaped frequency curve with a mean of about 12 pounds and a standard deviation of about 2.5 pounds. About 95% of the mean weights from samples of size 25 raccoons from this population fall between what two values? The Baltimore Sun (Haney, 21 February 1995) reported on a study by Dr. Sara Harkness, in which she observed the sleep patterns of 6-month-old infants. She found that a sample of n = 49 infants in the U.S. slept an average of 13 hours per day, and that the standard deviation of this sample was 0.5 hours. Compute a 90% confidence interval for the mean sleep time per day for 6-month-old infants in the U.S. Show your work and express your answer using exactly two (2) decimal places. The Baltimore Sun (Haney, 21 February 1995) reported on a study by Dr. Sara Harkness, in which she observed the sleep patterns of 6-month-old infants. She found that a sample of n = 49 infants in the U.S. slept an average of 13 hours per day, and that the standard deviation of this sample was 0.5 hours. Interpret the confidence interval you computed above using words that someone with no training in statistics might understand.
Literacy and Hunger Country % Who Are Literate (x) % Who Are Undernourished (y) Cuba 100 2 Egypt 71 4 Ethiopia 36 46 Grenada 96 7 Italy 98 2 Jamaica 80 9 Jordan 91 6 Pakistan 50 24 Russia 99 3 Togo 53 24 Uganda 67 19 Problem #38: Use the data above to solve these exercises: Use technology to determine the correlation coefficient, rounded to two decimal places, between percentage of people in a country who are literate and the percentage who are undernourished. Use technology to find the equation of the regression line for the percentage who are literate and the percentage who are undernourished. Round "m" and "b" to two decimal places. Use technology to determine the percentage of people, to the nearest percent, can we anticipate are undernourished in a country where 60% of the people are literate?
1.Pick a continuous variable (that is, interval or ratio in scale of measurement) that is normally distributed. Explain the distribution of the variable. What do scores in the center of the distribution mean for this particular variable? What about scores in the tails? If you have a z score of +2.58, what does that mean in terms of your specific variable? Please answer in both statistical and real- world language. Problem Set 4.2: Probabilities: Dichotomous Events Criterion: Calculate probability for a dichotomous event. Data: Jane has flipped a coin 10 times, and each time it has landed on heads. Instruction: Answer the following: What is the probability that Jane’s 11th flip will land on heads as well Problem Set 4.3: Calcuations on z and the Unit Normal Table Criterion: Calculate percentages based on z scores and the normal curve. Data: For homes that were sold in the past year, the average number of days on the market (DOM) was 266 days. During this time, DOM was normally distributed, with a standard deviation of 12 days. The Carmichaels sold their house in 245 days. Instruction: Using the unit normal table, answer what percentage of homeowners: a. Sold their home at the same point or earlier than the Carmichaels? b. Sold their home at a later point than the Carmichaels? c. Sold their home between 245 days and the average DOM? Problem Set 4.5: Area and the Normal Curve Criterion: Calculate z scores and find the area under a normal curve. Data: The mean combined SAT score for a sample of high school seniors is 1500 and the standard deviation is 250. Instructions: Answer the following: a. What percentage of students scored below 1000? What percentage of students scored above 1750
Week 2 Assignment The application assessment consists of six short answer questions. All work must be neat, detailed and clearly labeled. Final answers should be identified by either circling or underlining. Submit your work to the appropriate drop box as a Microsoft Word or PDF document. 1. On May 2, you receive your bank statement showing a balance of $1,641.18. Your checkbook shows a balance of $1,427.15. Outstanding checks are $167.31, $245.66, and $302.56. The account earned $62.11. Deposit in transit amount to $555.61, and there is a service charge of $8.00. Calculate the reconciled balance. CHECKBOOK BALANCE ___________ STATEMENT BALANCE ___________ Add: Add: Interest Earned & Other Deposits in Transit ___________ Credits ___________ SUBTOTAL ___________ SUBTOTAL ___________ Deduct: Deduct: Services Charges & Outstanding Checks ___________ Other Debits ___________ ADJUSTED CHECKBOOK ADJUSTED STATEMENT BALANCE ___________ BALANCE ___________ 2. On Novenber 4, your bank statement shows a balance of $2,253.18. Your checkbook shows a balance of $2,324.34. If there are outstanding checks in the amounts of $105.50 and $158.10, deposits in transit amount to $605.27, account earnings of $68.51 and there is a service charge of $5.00. Determine the Adjusted Checkbook Balance and the Adjusted Statement Balance. Draw a conclusion. 3. Solve each of the following equations and show how you checked your answers: a) 3x + 1 = 8 b) 3(n – 1) = 6 c) 2y + 4y = 6 – 3y 4. Kay and Allen sell cell phones. Last month Kay sold 17 more cell phones than Allen. Together they both sold 117 cell phones. How many phones did each of them sell individually? Show the equation you used to determine the answers. 5. At PrintAll copying, a new copying machine can produce five more than twice the number of copies per hour of the old copy machine. If the new machine produces 205 copies per hour, how many copies can the old machine produce? Show the equation you used to determine the answers. 6. A recipe calls for 2 cups of milk for every 6 1/4 cups of flour. If you increase the flour to 43 3/4 cups, how many cups of milk will you use? View your assignment rubric.
