A sports-and-exercise shop sampled its customer base one morning and asked 8 customers their age. Their responses are shown below.   24, 24, 25, 26, 28, 31, 36, 45   Which interval estimates the mean age of customers with a margin of error of 1.8?   25.2<μ<28.825.2<μ<28.8   26.1<μ<27.926.1<μ<27.9   28.1<μ<31.728.1<μ<31.7   29.0<μ<30.8

You want to estimate the mean amount of time Internet users spend on Facebook each month. How many Internet users must be surveyed in order to be 90% confident that your sample mean is within 10 minutes of the population mean? Based on results from a prior survey, assume that the standard deviation of the population of monthly times spent on Facebook is 210 minutes.

Use R code, place the steps and screenshots of the procedure From the following data of the diameter of a particle in (μm) Calculate: Sample mean, Sample standard deviationHistogram (Frequency vs diameter), Histogram (probability density vs diameter)Curves (equation and graph) that fit the graphs and their explanation Diameter (μm) 2 2.6 1.2 1.8 0.8 2 1.4 1.4 1.4 1.8 1.4 1.4 1.4 0.6 1.2 1.2 41.4 1.4 2.4 1.4 2 2.4 1.8 1.4 2 1.8 2 1.8 0.8 2.2 2.8 2.8 4.6 2 1.4 2.4 1.2 1.4 1.2 5 1.4 1.2 2 0.8 1.4 1.8 1.2 2 1.4 1.4 1.8 2.6

A developmental psychologist is interested in studying how long babies gaze at a photograph of a human face. To test this question, she shows a picture to a sample of six babies and records the length of their gaze in seconds. The data are as follows: 12, 17, 18, 20, 20, 29. Calculate the mean, median, mode, range, variance and standard deviation for the sample.

Find the proportion of N.d. observations with a zz-score between z_1 =z1​= -2.45 and z_2 =z2​= 2.71. Give your answer to four decimal places.

The length of fish were measured at 3 different lakes.  Is there evidence to suggest that the average length is not the same at all 3 locations? Lake 1:  3.5, 4.2, 2.1, 3.2, 1.7 Lake 2: 5.1, 6.2, 5.3,4.1 Lake 3: 5.6, 7.1, 6.4, 7.1, 6.4 What is your conclusion? There is not evidence that the mean length at one of the lakes is different then the others. There is evidence hat the mean length at a least one lake is different then the others.

Type size Mean S.D. I 10 136.7 4.5 II 15 138.3 4.6 7. | find the 98% econfidence interval for the difference of mean fabric strengths for the two types using a pooled interval. Interpret your answer.

An electric company wishes to estimate the true mean lifetime of its bulbs. It desires to be 98% sure that the true mean is estimated within 25 hours. If the lifetimes have standard deviation 150 hours, how many bulbs must be tested to achieve the desired accuracy? Edit View Table Insert Formt Tools 12pt v Paragraph v B IU 2 29 MAR 28 ...

To determine whether there is a significant difference in the weights of boys and girls beginning kindergarten, random samples of 50 boys and 50 girls aged 5 years produced the following information. Mean Standard Deviation Sample Size Boys 43.5 lb 6.8 50 Girls 38.7 lb 3.5 50 (a) What is the point estimate of the difference in the average weights for 5-year old boys and girls? (Use ?Boys − ?Girls.) lb What is the 95% margin of error for the point estimate you found? (Round your answer to three decimal places.) lb (b) What is the 98% confidence interval estimate of ?Boys − ?Girls? (Round your answers to two decimal places.) lb to lb