Find an 80% confidence interval for the heart rates of US adults over 25 if a sample of size 15 is SAR from the male population. The sample yields an average rate of 69.9 beats per minute. The standard deviations for the samples is 3.5 beats per minute. Assume heart rates in humans are normally distributed.

Q: The mean pulse rate​ (in beats per​ minute) of adult males is equal to 69 bpm. For a random sample…

A: The hypothesized mean is 69.

Q: It takes an average of 13.1 minutes for blood to begin clotting after an injury. An EMT wants to see…

A: The population mean or the hypothesized mean is .The sample size is .The sample mean is .The sample…

Q: The tread life of a certain brand of tires is known to be normally distributed with a mean of 40,000…

A: From the provided information, Mean (µ) = 40000 miles Standard deviation (σ) = 2000 miles X~N…

Q: The scores on a standardized test are normally distributed with a mean of 115 and standa deviation…

A: Z = 2.2 , μ  = 115 , σ= 15

Q: It takes an average of 10 minutes for blood to begin clotting after an injury.  An EMT wants to see…

A: Given, population mean,µ = 10 population standard deviation (σ) = 3.5 sample size (n)  = 54 sample…

Q: The drive distance (in yards) for professional golfers is normally distributed with a mean of 308.04…

A: 68-95-99.7-rule: Let X be an observation from a normal distribution, having mean µ and standard…

Q: It takes an average of 11.2 minutes for blood to begin clotting after an injury.  An EMT wants to…

A:

Q: umerus bones from the same species of animal have approximately the same length-to-width ratios. It…

A:

Q: Arsenic occurs naturally in some ground water and can be toxic. A mean arsenic level of μ=9μ=9 parts…

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…

Q: Based on data from the National Health Survey, women between the ages of 18 and 24 have an average…

A: From the given information, the mean is 114.8 and the standard deviation is 13.1.

Q: A sample of 13 concerts showed their average noise levels were 82 decibels and their standard…

A: Solution: Let X be the noise level From the given information, x-bar=82 decibels, s=7 decibels and…

Q: A random sample of 25 gallons of milk was selected and its content in fluid ounces was measured. The…

A:

Q: A petroleum engineer estimated the chances of drilling a dry well to be around 50% , and chances of…

A: The probability distribution of the amount of oil and the associated probability of drilling is as…

Q: UCES LIGHT BULBS, BULB NORMAL DISTRIBUTION WITH A MEAN OF 800 HOURS AND A STANDARD DEVIATION OF 40…

A: Answer Calculation:1. Calculate the z-score using the formula:      where:   - is the value we want…

Q: The shelf life of a battery produ wd by one major company is known to be Normally distributed, with…

A:

Q: Pulse rates of women are normally distributed with a mean of 77.5 beats per minute and a standard…

A: Given dataMean = 77.5Standard deviation = 11.5Formula to calculate z-score is given by

Q: A random sample of 100 observations produced a mean x̅ =38.5 and a standard deviation of 3.2. find a…

A: Given information Sample size(n) = 100 Sample mean x̅ =38.5 Sample standard deviation = 3.2…

Q: The health of the bear population in Yellowstone National park is monitored by periodic measurements…

A: Given Mean = 182.9 Standard deviation=121.8 n=54

Q: GPA of SMSU students is normally distributed with standard deviation (sigma) = 0.8. The average GPA…

A:

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A:

Q: Arsenic occurs naturally in some ground water and can be toxic. A mean arsenic level of μ=9 parts…

A: Given that α=0.005. Hence, the level of significance is 0.005.   The appropriate Null and…

Q: A recent study of 28 city residents showed that the mean of the number of years they lived at their…

A: The formula of confidence interval for the population mean is given by                  confidence…

Q: The age distribution of a sample of 5000 persons is bell shaped with a mean of 40 years and a…

A: GivenMean(μ)=40standard deviation(σ)=12

Q: A recent survey of 8 social network sites has a mean of 13.1 million visitors for a specific month.…

A: Given that, Mean = 13.1 Standard deviation = 3.1 Sample size = 8

Q: a life time of a certain brand of tires is approximately normally distributed with a mean of 42,500…

A: Given information- Population mean, µ = 42,500 miles Population standard deviation, σ = 3200 miles…

Q: Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She…

A: Given mean of 5.9 standard deviation of 3.4.

Q: laboratory tested 86 chicken eggs and found that the mean amount of cholesterol was x = 228 mg.…

A: We have to find sample size...

Q: Find the 80% confidence intervals for the variance and standard deviation of the ages of seniors at…

A:

Q: The average age of cars on the road in the United States follows a normal distribution with a mean…

A: The random variable age of car follows normal distribution. The population mean is 11.9. The…

Q: Weights of incoming college freshmen are normally distributed with a mean of 150 lbs. and a standard…

A:

Q: Find the 90% confidence interval for the standard deviation of the lengths of pipes if a sample of…

A: given data s = 10.2 n = 22 90% CI for σ = ? α = 1 - 0.90 = 0.10df = n - 1 = 21χ2L = χ21-α2,n-1…

Q: A report from 2010 indicates that Americans between the ages of 8 and 18 spend an average of μ = 7.5…

A: Given: Americans between the ages of 8 and 18 spend an average of μ = 7.5 hours per day distribution…

Q: The mean yield of corn in the United States is about 120 bushels per acre. A survey of 40 farmers…

A: Let μ be the population mean. The test is to check whether there is enough evidence from the sample…

Q: A university dean wishes to estimate the average number of hours that freshmen study each week. The…

A:

Ratios

A ratio is a comparison between two numbers of the same kind. It represents how many times one number contains another. It also represents how small or large one number is compared to the other.

Trigonometric Ratios

Trigonometric ratios give values of trigonometric functions. It always deals with triangles that have one angle measuring 90 degrees. These triangles are right-angled. We take the ratio of sides of these triangles.