A random sample of 73 accounts of a company shows the average days sales in receivables is 46 with standard deviation of 18 days. What is the p-value for the test of a hypothesis that the company's average days sales in receivables is 50 days or less? Use the normal approximation to calculate the p-value (the NORMSDIST() spreadsheet function will come in handy). Enter answer accurate to three decimal places. PLEASE USE EXCEL AND SHOW YOUR WORK.
A random sample of 73 accounts of a company shows the average days sales in receivables...
A random sample of 64 accounts of a company shows the average days sales in receivables is 48 with standard deviation of 18 days. What is the p-value for the test of a hypothesis that the company's average days sales in receivables is 45 days or less? Use the normal approximation to calculate the p-value (the NORMSDIST() spreadsheet function will come in handy). Enter answer accurate to three decimal places.
A random sample of 84 accounts of a company shows the average days sales in receivables is 49 with standard deviation of 17 days. What is the p-value for the test of a hypothesis that the company's average days sales in receivables is 47 days or less? Use the normal approximation to calculate the p-value (the NORMSDIST() spreadsheet function will come in handy). Enter answer accurate to three decimal places.
A company claims that their lightbulbs last an average of 400 days. To test this claim, a random sample of 25 lightbulbs is tested and it is observed that they last for an average of 380 days with a standard deviation of 60 days. Part A) Assuming that the population of the time to failure of all lightbulbs is normally distributed, test the null hypothesis that the average life-length of their lightbulb is 400 days against the alternative that it...
The average American gets a haircut every 40 days. Is the average different for college students? The data below shows the results of a survey of 16 college students asking them how many days elapse between haircuts. Assume that the distribution of the population is normal. 40, 40, 46, 40, 31, 46, 34, 44, 34, 42, 36, 27, 37, 46, 40, 37 What can be concluded at the the α α = 0.10 level of significance level of significance? For...
A random sample of 57 children with working mothers showed that they were absent from school an average of 5.3 days per term with a standard deviation of 1.8 days. If days absent follows a normal distribution, determine the critical value for the test statistic (z or t) needed to build a 98% confidence interval for the average number of days absent per term for all children. State the positive value only exactly as found in the table (3 decimal...
The average American gets a haircut every 42 days. Is the average smaller for college students? The data below shows the results of a survey of 11 college students asking them how many days elapse between haircuts. Assume that the distribution of the population is normal. 44, 31, 38, 48, 44, 38, 38, 44, 38, 44, 38 What can be concluded at the α = 0.10 level of significance? a. For this study, we should useb. The null and alternative hypotheses would be: c....
please disreguard as this quedtion was already answered
Test al the true average yield for this kind 10.27 A random sample from a certain piece of machinery were 9 days. Use the 0.01 level of s I t contention th ge yield for this kind of alfalfa is less than 2.0 tons pe ple from a company's very extensive files shows that orders for machinery were filled, respectively, in 12, 10, 17, 14, 13, 18, 11. a 0.01 level of...
A random sample of 20 family practitioners in a city had an average salary of $150,250 with a standard deviation of $32,400. Can you conclude that the true average family practitioner salary in this city is less than $180,000? It has been confirmed that the these salaries come from a normal distribution. What is the test statistic? Round to the fourth as needed.
The average height of 18-year-old males is 70 inches. A random sample of sixteen 18-year old males is selected. The average heights and standard deviation of heights came out to be 68.8 and 8 inches, respectively. At level of significance can we conclude that the average height has changed? a = .01 a) Set up test hypothesis b) Write test statistics and sketch. c) Apply classical or P-value method d) Draw conclusion and interpret.
GPA: The mean GPA at a certain university is 2.85. Following are GPAs for a random sample of 16 business students from this university 2.25 2.19 2.55 2.36 2.99 3.14 3.85 2.54 3.67 3.44 2.88 3.44 3.65 3.45 3.84 2.93 2 Send data to Excel Part: 0/5 Part 1 of 5 Following is a boxplot of the data. Is it reasonable to assume that the population is approximately normal? 20 25 30 35 to assume that the population is approximately...