Given that X is a normally clistributed variable 50 and a Standard deviation of a, find the p X is less than 55

Q: mals in an experiment with pory polygrap results are correct less than 80% of the time. Identify the…

A: Given n=97, level of significance ɑ=0.05, X=73, p=80%

Q: Show manual work and through r-studio if possible. Thanks in advance! The breaking strengths of a…

A: Given n=20,sample mean x̄=436.5, standard deviations =s=11.9

Q: How would you interpret a standard error of the estimate of 3.58?     Each 1-unit increase in X is…

A: we have to interpret standard error of estimate 3.58 .

Q: A city wants to know if a new advertising campaign to make citizens aware of the dangers of driving…

A: If the before and after on any information compared their mean significancy using the t test for…

Q: You are interested in investigating the efficacy of a stressor and design an experiment measuring…

A: The standard deviation of differences for t-test is calculated using the formula given by,  Sd =…

Q: 7. Uno™ is a competitive card game created by a barber in 1971. The original deck had 80 cards,…

A: Selection, election and collection - these three things are referred by the word combination. Unlike…

Q: You hypothesize that drinking water increases test scores so you design a study comparing test…

A: It is given that  n1 = 27 n2 = 35

Q: Engagement, the average student spends about 17 hours each week preparing for classes; preparation…

A: Given Mean=17 Standard deviation=4 n=16

Q: the tim mutation or the per mutation (Beaver and Giebultowice 2004): Mutation per tim Mean…

A: Given information: Mutation Mean coputation duration(min) Standard deviation of computation…

Q: Dougall compared the resting heart rate of average healthy citizens and soldiers suffering from…

A: According to the given information in this question We need to apply hypothesis test

Q: What is the standard deviation of differences? round to the nearest tenth

A: The data shows the efficacy of a new pain medication and placebo pain.

Q: The following information was obtained from matched samples taken from two populations. Assume the…

A: Given information: The given data is, Method 1(x) Method 2(y) 7 5 5 9 6 8 7 7 5 6…

Q: A simple random sample of size n=15 is drawn from a population that is normally distributed. The…

A: Given information: n=15 x=57 s=20 Confidence level is 95% Significance level is 5%=0.05…

Q: Refer to the accompanying data set of mean drive-through service times at dinner in seconds at two…

A: The table shows the service times of restaurants X and Y. The formula for finding the sample mean is…

Q: manufacturing industry, the number of industrial accidents averages three per week. Find the…

A: Given that  The number of industrial accidents averages three per week. X ~ Poisson (M = 3)

Q: A simple random sample with n= 52 provided a sample mean of 23.0 and a sample standard deviation of…

A: The sample size is 52, sample mean is 23.0 and sample standard deviation is 4.3.

Q: A manufacturing machine has a 7% defect rate. If 4 items are chosen at random, what is the…

A: It is given that a manufacturing machine has a 7% defect rate, and 4 items are chosen at random.

Q: Question 12 {3 decimal places } Find the degrees of freedom of the test statistic.

A: The data shows the appraisal value of an apartment of other companies.

Q: Periodically, the county Water Department tests the drinking water of homeowners for contaminants…

A: Given that: Lead (μμg/L) Copper (mg/L) 4.4 0.643 2.4 0.57 1.5 0.46 2.6 0.895 5.9 0.2…

Q: A simple random sample of size n=350 individuals who are currently employed is asked if they work…

A: We have given that  Sample size n =350 Favorable cases x =42 Sample proportion p^=x/n  =42/350 =0.12

Q: Three cards are drawn from the deck (and not replaced). What is the probability that they are not…

A: It is given that three cards are drawn from the deck with out replacement.

Q: QUESTION 12 You hypothesize that drinking water increases test scores so you design a study…

A: According to the given information in this question We need to apply two sample t test

Q: ‘In 1996, 31% of students reported that their mothers had graduated college. In 2000, the percentage…

A: The formula to calculate z-test statistic for proportion is given by,  ztest = (p̂ – p)/√[p(1–p)/n]…

Q: Question 4 It is well-known that ridge regression tends to give similar coefficient values to…

A: The following solution is provided below:

Q: 4. Use exponential regression to find the equation of the graph shown. Round the coefficient and the…

A: The exponential regression equation is given as: y=abx where, y is the independent variable, and x…

Q: A fitness center is interested in finding a 90% confidence interval for the mean number of days per…

A: From the provided information, Sample size (n) = 265 Sample mean (x̄) = 3.5 Sample standard…

Q: The variance between groups as a ratio within groups is the critical t-value pooled variance O…

A: Last option is correct  t test statistic

Q: he scores on a test have a mean of 100 and a standard deviation of 15.  If a personnel manager…

A: given data, assume the variable is normally distributed.μ=100σ=15If a personnel manager wishes to…

Q: The amount of time it takes Sally to do her Math Practice Quiz is uniformly distributed between 5…

A: given data  x = time required to give quiz uniformly distributed between 5 and 20 minutes X~U(5,20)…

Q: Direction: Perform hypothesis testing. Show all the steps and solutions. Note: Excel / Stat…

A: Given  For one tailed  P value=0.004154942 Level of significance ɑ=0.05

Q: A researcher wants to investigate whether mood is related to chocolate consumption. She recruits a…

A: Claim : The mood is related to chocolate consumption we have to use  Chi-square test of independence…

Q: 1a. A random variable Z is normally distributed with mean 0 and standard deviation 1. It is known…

A: Given that: Pz<-1.6=aPz>2.4=b

Q: A developer wants to know if the houses in two different neighborhoods were built at roughly the…

A: Given data: Neighborhood 1 Neighborhood 2 57 32 46 47 49 41 51 57 56 43 47 50

Q: A lightbulb manufacturer ships large consignments of lightbulbs to big industrial users. When the…

A: As Prof. A. M. Goon said "Let A1, A2, ... , An be n mutually exclusive and exhaustive events with…

Q: Does the p value 0.059 matter in this correlation test? Do we reject the null or not?

A: For the given Correlation test, the relevant hypotheses are: Null Hypothesis H0:ρ=0 i.e., the…

Q: In a criminal trial in the United States, it must be proven that a defendant is guilty beyond a…

A: Event involves all the possible outcome of the experiment happening. If an event happen already…

Q: QUESTION 10 You hypothesize that drinking water increases test scores so you design a study…

A: Given that  Sample sizes n1=27 , n2=35 Sample means x1=62 , x2=75 S1=13 , S2=11

Q: A study was conducted to determine the average length of time mothers spend in social media daily. A…

A: Given claim: The average time spent by mothers is more than 4 hours daily. Null Hypothesis: H0: The…

Q: The National Center for Education Statistics reports that the high school dropout rate is 5.3%. Due…

A: The given claim is that the high school dropout rate in New York State differs from the national…

Q: The random variable X is normally distributed such that X~N(?, 12). It is known that ?(? > 32) =…

A: It is given that the probability of x greater than 32 is 0.0618. and the standard deviation is 12.

Q: For the standard normal variable ZZ , find the probability P(0.07<Z<3.52)

A: We will use Excel to find the required probability based on Standard Normal distribution.

Q: An insurance company checks police records on 579 accidents selected at random and notes that…

A: given data  n = 579 x = 95 95% ci for p.

Q: Refer to the accompanying data display that results from a sample of airport data speeds in Mbps.…

A: given data  ci is : (13.046,22.15) x¯ = 17.598sx = 16.01712719n = 50

Q: Suppose ? follows the standard normal distribution. Determine the value of ? such that ?(−0.66 ≤ ? ≤…

A: Solution-: We find x value such that, P(-0.66≤Z≤x)=0.7027

Q: Find the mode: 15, 20, 14, 16, 23, 15, 22, 21 Mode

A:

Q: find the probability P(F>1.27)P(F>1.27): P(F>1.27)=P(F>1.27)=

A: It is given that  F ~ F( 11, 10 ) df1 = 11,    df2 = 10 F-score = 1.27

Q: Suppose taxi fare from Logan Airport to downtown Boston is known to be normally distributed with a…

A: Given X = $22.10, $23.25, $21.35, $24.50, $21.90, $20.75, and $22.65 n=7 Standard deviations=2.50

Q: Despite tuition skyrocketing, a college education is still valuable. Recent calculations by the…

A: x x2 34632 1199375424 36034 1298449156 36072 1301189184 44592 1988446464 44768 2004173824…

Q: If we find a 95% confidence interval using a sample, then we can say... 95% of individuals will fall…

A: According to the given information in this question We need to identify the correct option

Q: 3. A financial advisor needs to meet her quota of 30 clients in a year. To do that, she sought help…

A: 3 :  She needs to meet her quota of 30 clients :  She ask her friends to as their friends to be…