Find a 95% CI on the population standard deviation of speeds of drivers ticketed in a 55 mph zone       with n = 25,  66.2 mph, s = 3.4 mph

Q: number 4

A: A frequency table is used to understand the number of times an observation occurs. The cumulative…

Q: a manufacturer claims that the mean lifetime of its fluorescent bulbs is 1050 hours. a homeowner…

A: Given n=40 Standard deviation =80 Xbar=1030 Level of significance=0.05 Mu0=1050

Q: A group of 30 students were sampled and measured their height. The average height was 168cm, with a…

A: Obtain the weight represents the 5th percentile. The weight represents the 5th percentile is…

Q: Assume that the speed of automobiles on an expressway during rush hour is normally distributed with…

A: The detailed solution is as follows below:

Q: The weights of adult California Condors average 14.8lbs with a standard deviation of 3.25lbs.…

A:

Q: Suppose a small paint manufacturing company has a daily production that is normally distributed with…

A: Solution: It is given that a small paint manufacturing company has a daily production that is…

Q: In a survey, the mean weight of 1026 rats was calculated to be 132 gr. The standard deviation of the…

A:

Q: The height for an adult American male resident is normally distributed with average 175.3…

A: given data normal distribution μ=175.3σ=7P(x>171)=?

Q: Suppose that a category of world class runners are known to run a marathon (26 miles) in an average…

A: The random variable X is the average of the 49 races. The mean is 142, and standard deviation is 13.…

Q: At wind speeds above 1000 centimeters per second, significant sand-moving events begin to occur sand…

A: The hypotheses are, H0: µ≤1,000 centimeters (The wind speed is less than or equal to 1,000…

Q: The average monthly income for employees at a local company is 2413 with a standard deviation of…

A: Mean()=2413standard deviation()=450Employee  makes 1917 per month

Q: The state of California had a mean annual rainfall of 23 inches and a standard deviation of 4…

A: Answer: From the given data, Let X denotes the mean annual rainfall of California Here, X is…

Q: The speeds of all cars on the tollway was found to be normally distributed with a mean of 63 miles…

A: It is given that that µ=63 mile per hour. Obtain the standard deviation of the speeds of all cars:

Q: A livestock company reports that the mean weight of a group of young steers is 1154 pounds with a…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: 1. The life spans of a particular species of turtle are normally distributed with a mean of 180…

A: Given that mean =180 ,s.d =40 P ( 100 <X < 260) = ?

Q: Steel rods are manufactured with a mean length of 25 centimeters (cm). Because of the variability in…

A: Given, Steel rod length are normally distributed with mean 25 cm and standard deviation 0.07.

Q: Steel rods are manufactured with a mean length of 27 centimeter​ (cm). Because of variability in the…

A: Given,mean(μ)=27standard deviation(σ)=0.06

Q: The lengths of trout in a lake are normally distributed with a mean of 30 inches and a standard…

A: The z-score denotes how many standard deviations an individual raw score is away from the mean The…

Q: mean number of customers arriving at a restaurant during a 15-minute period is 9. Find the standard…

A: Given that :   The mean number of customers arriving at a restaurant during a 15-minute period is 9.…

Q: A mechanical device has a wear out time distributed normally with a mean of 1100 hours and a…

A:

Q: What is the storm return associated with a flow of 17,562 cfs when the mean is 12,500 cfs and a…

A:

Q: A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of…

A: Let X be the length of the steel rods. Then X~N (144.3,0.8) i.e. µ=144.3 and σ=0.8

Q: A laboratory in Oregon is interested in finding the mean chloride level for a healthy resident in…

A: GivenMean(x)=104standard deviation(σ)=38sample size(n)=150confidence level=99%

Q: what would be a good hypothesis for calculating the average speed for cars

A: Introduction Hypothesis is an assumption that is being tested.

Q: A particular fruit's weights are normally distributed, with a mean of 659 grams and a standard…

A: From the provided information, Mean (µ) = 659 grams Standard deviation (σ) = 7 grams Let X be a…

Q: A particular fruit's weights are normally distributed, with a mean of 230 grams and a standard…

A: The provided information is:

Q: The salaries of 300 employees of a certain factory in Baguio City have a mean of P6,500 and a…

A:

Q: Assume the mean length of a the female foot is roughly 9.58 in. with a standard deviation of 0.51…

A: From the given information, the mean of 9.58 and a standard deviation of 0.51. The  standard…

Q: A ski gondola carries to the top of a mountain. Assume that weights of skiers are normally…

A: Given :  Load limit = 3500lb Number of passengers = 25 mean = 180lb standard deviation = 44l

Q: Suppose that a category of world class runners are known to run a marathon (26 miles) in an average…

A: Given that μ=142σ=13n=49

Q: A particular fruit's weights are normally distributed, with a mean of 621 grams and a standard…

A: It is given that the fruits weights follow normal distribution with mean 621 and standard deviation…

Q: A manufacturer of calculator batteries claims that the mean length of life for its battery is 500…

A: The empirical graph is, The random variable X is defined as the length of life for its battery. The…

Q: A livestock company reports that the mean weight of a group of young steers is 1142 pounds with a…

A: Let X be a random variable such that X: Weight of a young steer X~N1142, 792 a) The probability of…

Q: e diameters of Douglas firs grown at a Christmas Tree Farm are normally distributed with a mean of 4…

A: GIVEN DATA, normal distributionμ=4σ=1.5we have to find out the given probabilities.

Q: The average amount of precipitation in a city during the month of March is 2.8 inches. Assume the…

A: The average amount of precipitation in a city follows a bell-shaped curve thas is equivalent to say…

Q: In a county male height is normally distributed with a mean of 175 cm and a standard deviation of 6…

A: Given that.   X~N( μ , ?^2 )   μ=175   , ?=6   Z-score =( x - μ )/?

Q: The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1500…

A:

Q: A normal population has the mean m=70 and standard deviation 20. what proportion of the population…

A: Obtain the proportion of the population is greater that 95. The proportion of the population is…

Q: A lightbulb is advertised as lasting 1000 hours with a standard deviation of 150 hours. Assume the…

A: It is given that the mean and standard deviation are 1,000 and 150, respectively.

Q: for a population with a standard deviation of 10 and mean of 100, draw a bell shaped curve, marking…

A: We have to draw bell shaped curved and marking location of the mean and standard deviation..

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.