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?

Q: The heaviest 4% of fruits weigh more than how many grams? Please give your answer to one decimal…

A: Let x be the particular fruit's weights which follows normal distribution with mean 670 grams and…

Q: Compute for the following problems stated below. Upload your computation for each problem. Express…

A: The values obtained in the analysis of sodium hydroxide  are as follows : 99.5% 99.9% 99.7% 96.9% So…

Q: The figure below illustrating chemical process concentration readings made every hour. The minimum…

A: Explanation:   From the time-series plot, it is clear that there is no specific pattern in the…

Q: Compute for the following problems stated below. Upload your computation for each problem. Express…

A: Hi, since you have posted a question with multiple sub-parts, we will solve first three sub-parts…

Q: (a) If 60 people are riding the coaster, and their total weight is 12,000 pounds, what is their…

A: The mean of the men is 193 and the standard deviation is 68 pounds.

Q: he number of cans of soft drinks sold in a machine each week is recorded below. Develop forecasts…

A: Introduction: We need to forecast using the three-week weighted moving average method, and obtain…

Q: There is a new fertilizer that is supposed to increase plant growth. To test this, 16 soy bean…

A: The given values are  Sample size = n= 16 the sample mean = X  = 24 The sample standard deviation =…

Q: The level of confidence is %.

A: In a sample of 80 light bulbs, the mean lifetime was 1217 hours with a standard deviation of 53…

Q: a values that would allow 55% of the data to fall within the mean observing symmetry? Draw the curve…

A: Mean and standard deviation are given below:  μ = 8.70σ=2.1846 Z-score is a measure that indicates…

Q: Will you provide an example of Standard Deviation math problem and solution?

A: Standard deviation:The standard deviation indicates by how much each observation differs from a…

Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. a) Draw a…

A: The provided information is  µ=100 σ=15 a. The detailed sketch is

Q: the average grade is 84 with a standard deviation of 4. What is each grade for -1 2 0 1.5 -1.25

A: Given Mean μ=84Standard deviation σ=4 The formula for Z score isZ=X-μσX=Z×σ+μ

Q: c. The test statistic | (please show your answer to 2 decimal places.) d. The p-value = places.)…

A: C. The pooled estimate is, sp=n1-1s12+n2-1s22n1+n2-2=57-192+42-110257+42-2=8,63697=89.0309=9.4356…

Q: A particular fruit's weights are normally distributed, with a mean of 751 grams and a standard…

A:

Q: When tossing two dice and finding the mean, X we find that has a mean or expected value, and a…

A: Here, it is known that the mean is 3.5 and a population standard deviation of 1.7078. The sample…

Q: The average amount of time it takes for couples to further communicate with each other after their…

A: a. For this study, we should use one sample population mean z test.

Q: What is the standard deviation of the average fill volume of 100 cans?

A: We have given that the fill volume of cans are independent, normal random variables. The standard…

Q: The diameters of bolts produced in a machine shop are normally distributed with a mean of 5.7…

A: GivenMean(μ)=5.7standard deviation(σ)=0.08

Q: Find the estimated mean speed

A: Given Information: Speed (mph) Cars 30-39 7 40-49 16 50-59 51 60-69 16 70-79 10 To…

Q: Part 1 of 5 (a) State the appropriate null and alternate hypotheses. H1: This hypothesis test is a…

A: mu = 2.1 xabr = 1.95 n = 54 sigma = 0.4

Q: Researchers measured the data speeds for a particular smartphone carrier at 50 airports. The highest…

A: Given: highest speed=74.3 mean(x)=15.94 s=22.26

Q: Imagine you select 30 males at random and find their mean height to be 5 ft 11 in. tall with a…

A:

Q: alculations. 155, 145, 155, 162, 180, 165, 172, 149, 170, 172 Exponential smoothing.  Use an alpha…

A: week   1 155 2 145 3 155 4 162 5 180 6 165 7 172 8 149 9 170 10 172

Q: Which statistical measurement is used to measure minutes?  Is it ordinal, nominal or scaled?

A: Nominal: When the possible observations are tags or categories or names, without any natural…

Q: Can you help figure out what percentile 78/345 is please? I need to know if it is above 80% .

A: Percentile: The value below which a percentage of data falls is known as the percentile. The formula…

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: 4. Find combined mean from the following data ¯¯¯X₁ = 210 n₁=50 X₂ = 150 n₂ =100

A:

Q: According to the National Center for Health Statistics, the mean systolic blood pressure for males…

A:

Q: A psychologist is studying smokers' self-images, which she measures by the self-image (SI) score…

A:

Q: A research study investigates the occurrence of extra heartbeats between untrained and trained older…

A: Given the data as

Q: A manager wants to estimate the mean hourly yield for a process that manufactures an antibioti He…

A:

Q: Please review Section 9.2. A marketing researcher wants to estimate the mean amount spent per year…

A: As per our guidelines we are supposed to answer only one question per post so I am solving first…

Q: The number of cans of soft drinks sold in a machine each week is recorded below. Develop forecasts…

A: Given  Sales of cans of softdrinks for week We have to calculate forcast for week 10 and mean…

Q: A California lake has been stocked with rainbow trout. These trout have an average length of 24…

A: Given Information: Mean μ=24 Standard deviation σ=3 Someone goes fishing and catches a trout that is…

Q: Calibrating a scale: Making sure that the scales used by businesses in the United States are…

A:

Q: Suppose that the speeds of cars travelling on California freeways are normally distributed with a…

A: Given X=80 Mean=63

Q: Use the following excerpt to answer the questions below. In the state of California, there is an…

A: a) Here the hypothesis are given by H0: μ=7500 vs H1:μ>7500 b) Here the random variable follows a…

Q: The average annual cost of tuition for all 49 public 2 year colleges (Alaska did not submit data)…

A: Hi! Thank you for the question, as per the honor code, we are allowed to answer three sub-parts at a…

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.