If a quality control manager wants to estimate the mean life of light bulbs to within + 21 hours with 99% confidence and also assumes that the population standard deviation is 85 hours, how many light bulbs needed to be selected?

Q: 1.) boys and girls are alternating 2.) 2 particular people must not sit next to each other 3.) if ...

A: 5 boys and 5 girls be seated in row of 10 chairs

Q: Suppose that z,., Zn are fixed constants and that for i = 1,..,n, X, is normally distributed with me...

A: “Since you have posted a question with multiple subparts, we will solve the main question for you. T...

Q: You run a regression analysis on a bivariate set of data (n=54n=54). With ¯x=35.7x¯=35.7 and ¯y=30.3...

A: Given that  n=54 x¯=35.7 and ¯y=30.3 y=3.958x-111.001 r=0.379  

Q: Calculate Pearson's coefficient of correlation from the following data. Take 65 and 70 as the assume...

A:

Q: a bag contains 3 white and 5 black balls. if two are drawn in replacement.what is the probability th...

A: GivenA bag contains no. of white balls = 3no.of black balls =5Total no. of balls = 8

Q: Given the provided data, identify if there has been a change in the prevalence of hypertension in th...

A: It is given that 15% of adults from the province of Realeza are hypertensive. A survey was conducted...

Q: Find out the median of the following items 10, 8,.5, 13, 4, 9, 7

A:

Q: 1.How many respondents should be chosen from Luzon? A. 125 B. 150 C. 175 D. 200 2. What type of samp...

A: Given that, a sample of respondents who own a Laundry Business from Luzon, Visayas, and Mindanao. Th...

Q: # 3) Rockwell hardness testing is an indentation testing method. The indenter used is either a spher...

A: F test is used to measure the variability in the data set. It is a type of parametric test. Under th...

Q: For Questions 1 and 2. Describe a method for using a table of random digits to samples. Then use the...

A: Method for using a table of random digits to obtain the random samples:  

Q: How many four-digit numbers can be formed from the digit 0, 1, 2, 3, 4,5, 6, 7, 8 ,9 if each digit c...

A: Here use combination 

Q: (d) Find the least-squares regression line treating the rate of return of Company 1 as the explanato...

A: In order to obtain the regression equation, first perform regression analysis on the data.

Q: XrepresentStandom variable coming from a normal distribution and P(X <8.4)

A: Given,P(X&lt;8.4)=0.53

Q: Consider the experiment of t_wo dice are draw_n. Let  X be a random variable representing the differ...

A: The given experiment is of two dice are thrown simultaneously. The random variable is difference of ...

Q: A 98% confidence intervals for the proportion of first-year statistics students with brown hair is g...

A: Solution-: We have 98% C.I. (0.28,0.42) We find, (d) The standard error of estimate=? (e) What is sa...

Q: What is the level of measurement of the variable “Number of owner of laundry business”? A. Nominal B...

A: The objective is to find out the level of measurement of the variable "Number of owners of a laundry...

Q: 7. A Random Variable X has an unknown distribution, a known mean of 10 and an unknown variance, o. T...

A:

Q: If f is a probability density function of a continuous random variable x over [a,b], then the median...

A:

Q: (e) A teacher instituted a new reading program at school. After 10 weeks in the program, it was foun...

A: The given values are μ=92;σ=10 The distribution followed by the random variable X is X~Nμ,σn. That i...

Q: The density function of a certain random variable X is given by 1 B(a, e)*(1 – x)o-1 0, f(x) ,if 0 <...

A:

Q: Suppose you run a simple regresson model and you obtain estimator βˆ 1 (β1 is the population paramet...

A: From the above data  The interpretation of confidence interval of slope is in 

Q: Total plasma vgiume s important is determining the required plasma component in blood replacement th...

A: Here is given that mean is 37.5 and standard deviation is 7 and number of sample is 43.

Q: write I if the events in the given experiment are independent and D if not.   1. A head shows on a...

A: Here, we have to identify whether the event is dependent or independent.

Q: A store in donated a lot of 8 computer sets that includes 3 which are malfunctioning or defective. I...

A: Given that  Total computer=8 Defective computer=3 p=Probability of Defective computer  p=3/8=0.375 4...

Q: You intend to estimate a population mean with a confidence interval. You believe the population to h...

A:

Q: The main cost of a 5 pound bag of shrimp is $46 with a variance of 49 if a sample of 48 bags of shri...

A:

Q: A bag contains 7 red, 12 white and 4 green. balls. What is the probability that : (a) 3 balls drawn ...

A:

Q: In a survey, 26 people were asked how much they spent on their child's last birthday gift. The resul...

A:

Q: The mean body mass index (BMI) for boys age 12 is 23.6 kg/m2. An investigator wants to test if the B...

A: Given  detect a difference in BMI of 2 kg/m2 standard deviation in BMI is 5.7 kg/m2.   Asume that al...

Q: Forty randomly selected students were asked the number of pairs of sneakers they owned. Let X = the ...

A: Given  n=40

Q: write ME if events are Mutually Exclusive and write I if Inclusive.   1. Selecting a female or a g...

A: Solution-: We identify following events are mutually exclusive or inclusive. Selecting a female or a...

Q: Forest rangers use the diameter of a tree's trunk to predict the age of the tree. They have determin...

A: Solution-: We find the linear regression equation to estimate the age of a tree of this variety with...

Q: local five-star restaurant asks its patrons to fill out a quick satisfaction survey (is the patron s...

A: Here is given that sample number is 192 Sample satisfaction rating is 77.7%. = 0.777 P = x / n and x...

Q: 16. If 12P4 = 11,880 , then what is 12C4 ? *     495 330 715 220

A: GivenP412=11880

Q: Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval...

A:

Q: i) Find the probability of winning a prize at most two times. ii) How many tickets he has to purchas...

A: Given: Sample size, n=12 Probability of not winning prize, q=0.92

Q: When two dice are thrown , find the expectation of sum of numbers (digits) on them.

A:

Q: Which of the following histogram correctly shows the sampling distribution of sample means of size 2...

A: The population is the set of all the possible elements or observations. The sample is the subset of ...

Q: 1. How do you solve confidence intervals? 2. What do Confidence intervals tell us?

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any ...

Q: Consider the dataset given in PS 1. It was hypothesized that the local fishers in Guimaras are resid...

A:

Q: You want to know if male green darner dragonflies (Anax junius) are territorial so you collect data ...

A: Given The data is as follows: Number of male green darners/square meter 7 6 7 7 8 7 ...

Q: A communication system consists of n components, each of which will independently functions with pro...

A: Given: Probability that system operate effectively is p System will operate effectively if at least ...

Q: If n=13, ¯xx¯(x-bar)=37, and s=9, construct a confidence interval at a 80% confidence level. Assume ...

A: Givenn =13x = 37s=9confidence interval =80%

Q: A store in donated a lot of 8 computer sets that includes 3 which are malfunctioning or defective. I...

A: Given : No. of computer (N) = 8 Let Y : No. of defective or malfunctioning computer sets Here  Y  = ...

Q: Area = 0.3577, Area = 0.0557 8.5 11.0 Part: 0 / 3 Part 1 of 3 (a) Find the proportion of cats who we...

A: Given

Q: Indicate whether the following statements are true, false, or uncertain, and provide a short (no mor...

A: Summary of Statements: When y has a measurement error that is independent of x, the range of estimat...

Q: question(8):  A researcher was interested in the effect in the effect of job security on stress. Th...

A: The objective is to state whether given design is is a independent study design. Independent measure...

Q: 4.2. One at a time, until the lock is opened (keys that do not work are disca before another is trie...

A: Since you have posted multiple questions, as per our guidelines, we have provided answer for first q...

Q: Four coins are tossed simultaneously. What is the probability of geting (i) 2 heads and 2 tails (ii)...

A:

Q: 12. How many ways can 3 jellybeans be chosen from a bag of 17 unique jellybeans *     360 120 136 68...

A: Given,Total no.of unique jellybeans=17