Please find the VARIANCE AND STANDARD DEVIATION. Please explain it too.
Q: Losing weight A Gallup Poll found that 59% of the people in its sample said "Yes" when asked, "Would...
A:
Q: Test the claim about the difference between two population means u, and z at the level öf sighifican...
A: Given that Sample sizes n1=14 , n2=9 Sample means X̄1=2417 , X̄2=2291 s1 =173 ...
Q: Researchers at the Mayo Clinic have studied the effect of sound levels on patient healing and have f...
A: New Flooring Old Flooring 42 48 41 51 40 ...
Q: In a fandom sample of 41 criminals convicted of a certain crime, it was determined that the mean len...
A:
Q: In a previous nationwide poll of a large country, 46% of adults with children under the age of 18 re...
A: The random variable X follows normal distribution. We have to test whether the proportion of familie...
Q: Derived RVs. Suppose you are running a simulation on a large data set. Assuming that the task is par...
A: X : Time completion at first worker node Y : Time completion at second worker node. Given, X and Y a...
Q: A study indicates that 18- to 24- year olds spend a mean of 115 minutes watching video on their smar...
A:
Q: Suppose a sample of 155 students at a university were asked their grade in statistics. 21 said they ...
A: Given that n=155 Number of success=21 , Number of failures=134
Q: What is the area under the normal curve at the right of Z -1.20? What is the area between Z = -1.20 ...
A:
Q: The time it takes a group of Grade 11 students to complete the Final Exam in Statistics and Probabil...
A: The mean is 58 and the standard deviation is 4.
Q: 4. A small firn Two alterna estimated. A would be $1 a. Determir b. At what с. If expecte
A:
Q: A developer who specializes in summer cottage properties is considering purchasing a large tract of ...
A: Linear Regression by Data Analysis Toolpak We will use Excel to solve this: enter the Data are shown...
Q: According to a report, 62.8% of murders are committed with a firearm. (a) If 100 murders are randoml...
A: From the provided information, 62.8% of murders are committed with a firearm that is p = 0.628
Q: The u.s. Bureau of labor statistics reported the mean hourly wage rate for individuals in executive,...
A: Given that mu =26 ,sigma =4,n =115 p( x bar > 27 ) =?
Q: Lecture(10.4A): Large values of the F statistic (signifcantly greater the 1) suggests which of the ...
A: Given F test statistic >1
Q: A political candidate feels that she performed particularly well in the most recent debate against h...
A: From the provided information, 95% confidence interval for the true difference in proportions of lik...
Q: Draw a normal distribution curve and find the percentage of the bounded regions in each item. A larg...
A: Here is given that, mean is 70 and standard deviation is 10. We will use z-standard normal distribut...
Q: A bank report looks at what strategies and measures financial institutions are pursuing to provide m...
A: Given that, Cybersecurity is a critical business issue that demands the attention of business and IT...
Q: A Kabwe based Civil Engineering firm has to bid for the construction of the dam in Chibombo area. Th...
A:
Q: The Table below shows the average score of the150 students sampled from the University of the East E...
A: Use your results above to comment on the shape of the distribution. Give a reason for you answer. ...
Q: of sighihcance a. Assume the samples are random and dependent, and the populations are normally dist...
A:
Q: A math teacher claims that she has developed a review course that increases the scores of students o...
A: d) The sample mean is 526 and the standard deviation is 112.
Q: Which of the following situations illustrates combination? A. Determining the arrangement of 7 potte...
A: According to our guidelines, we will answer only 3 problems starting from the top. Given some probl...
Q: An engineer wants to know if producing metal bars using a new experimental treatment rather than the...
A: For the given data Which hypothesis is the claim ?
Q: te d and sa
A:
Q: e claims that the mean amount spent by a customer at Burger Stop is greater than the mean amount spe...
A: Given
Q: Assume that the people’s ages at the onset of a certain disease have a normal distribution with a me...
A:
Q: Hurricane Damage Find the percentile rank for each value in the data set. The data represent the val...
A: Given data 2.3,3.3,6.2,7.9,9.6,11.3 N =6
Q: A student earned grades of B, C, A, B, and D. Those courses had these corresponding numbers of credi...
A: Solution: The data values are B,C,A,B and D or 3, 2, 4, 3 and 1 The weights are the number of cred...
Q: When we are calculating variance (or standard deviation) for a sample and intend to use it as an est...
A: Given information: s=∑xi-x¯2N-1s2=∑xi-x¯2N-1
Q: To test Ho: u = 40 versus H,: µ < 40, a random sample of size n = 24 is obtained from a population t...
A:
Q: Two cards are chosen from a pack of cards without replacement. Are the following events independent?...
A: We have given that the statement about to the independent or not independent events.
Q: In a study, researchers wanted to measure the effect of alcohol on the hippocampal region, the porti...
A:
Q: The results of a recent poll on the preference of teenagers regarding the types of music they listen...
A: Here is given that, two populations and two selected samples. We will use two proportion point estim...
Q: ndependent random samples taken on two university campuses revealed the following information concer...
A: For the given data Which test do you need to use for this question?
Q: 1, Y2, · · , Y9 and it is believed that Y; ~ N(u, 16). Find P(|Y – µl < 2). ...
A:
Q: 2 2 3 12 丁
A: Here, we have to do multiplication of two fractions.
Q: standard deviation of 6. Find the probability that a randomly selected student score more than 80 po...
A: Let X be the random variable from normal distribution with mean (μ) = 74 and standard deviation (σ) ...
Q: The following are the ratings of males by females in an experiment involving speed dating. Use the g...
A: Solution-: We find the five number summary for given data Select correct boxplot to represent the d...
Q: Control charts for X and R are maintained on dissolved iron content of a certain solution in parts p...
A: Given ∑x¯=390.8 ∑R=84 Find values of 3-σ control limit
Q: A team of experts to study a local medicine for coronavirus is to be chosen from 4 doctors from luzo...
A: We have given that the 4 doctors from luzon, 3 from visayas and 2 from mindanao. Combination formu...
Q: and the last digit must De 3! [Q2] A box contains 12 red balls, 8 white balls, and 6 blue balls. (a)...
A: Given that Total ball =12+6+8=26 Red ball=12 Blue ball=6 White ball=8
Q: Researchers measured the data speeds for a particular smartphone carrier at 50 airports. The highest...
A: Solution: Given information: n= 50 data speeds Highest data speeds= 75.5 x= 15.67 Sample mean s= 36....
Q: The amount of sodium sulfate, in mg, found in the bottled water follows a normal distribution with a...
A:
Q: Let A denote the event of placing a $1 straight bet on a certain lottery and winning. Suppose that, ...
A:
Q: Find the standard deviation, s, of sample data summarized in the frequency distribution table below ...
A: Find s.d =?
Q: A principal of a large high school wants to estimate the true proportion of high school students who...
A: Given that Sample size n =50 95 % confidence interval. (0.25 , 0.34 )
Q: A researcher hypothesizes that performance on a cognitive test will be better when people have had a...
A: Hypothesis testing : Hypothesis testing is a type of statistical inference that uses sample data to ...
Q: Ho:µ 17.2 Your sample consists of 30 values, with a sample mean of 18.4. Suppose the population sta...
A: As per our guidelines we are supposed to answer only 3 subpart of any questions so i am solving firs...
Q: Find the standard deviation, s, of sample data summarized in the frequency distribution table below ...
A: For the given, grouped frequency distribution table, we need to find the standard deviation and com...
Step by step
Solved in 2 steps with 2 images
- Fluoride Exposure in Drinking WaterExercise 2.250 introduces a study showing thatfluoride exposure might have long-term negativeconsequences for the offspring of pregnant women.Part of the study examines the effect of adding flu-oride to tap water on mean fluoride concentrationin women. Summary statistics for fluoride concen-tration (measured in mg/L) for the two groups are given in Table 6.17. Find and interpret a 99% con-fidence interval for the mean increase in fluorideconcentration for those with fluoridated tap water. 1. find the t-score enter positive z-score 2. find the standard of error round 4 decimal places. 3 find the margin of error round 4 decimal placesA report about an isolated community claims there are more newborn females than males, although we assume equal frequencies for each. Records indicate 628 boys and 718 girls born in the past month. What are H0 and Ha? Compute χ2obt. What is χ2crit? What do you conclude about birthrates in this community?A random sample of CO2 levels in a school has a sample mean of x¯=598.4 ppm and sample standard deviation of s=86.7 ppm. Use the Empirical Rule to determine the approximate percentage of CO2 levels that lie between 338.3 and 858.5 ppm.
- A ressearcher reports that her obtained chi square of -17.56 is significant because it exceeds the critical Chi square of -3.841 for an alpha of .05 with 2 degrees of freedom. What mistake has been made? a. neither critical nor obtained Chi squares can have negative values b. it is impossible to have only 2 degrees of freedom c. it is impossible for obtained Chi square to exceed 10 d. a one-tailed test should have been usedFind kurtosis by using ungroup data given in the picture using quartile deviation, make sure to arrange data before solving question.8.7 It is conjectured that when fields are overgrazed by cattle there will be a substantial reduc- tion in the available grass during the subsequent grazing season due to the compaction of the soil. A horticulturist at the state agricultural experiment station designs a study to evaluate the conjec- ture. Twenty-one plots of land of nearly the same soil texture and suitable for grazing are selected for the study. Three grazing regimens selected for evaluation are randomly assigned to 7 plots each. After the 21 plots are subjected to the grazing regimens for four months, the researcher randomly selects 10 soil cores from each plot and measures the bulk density (g/cm3) in each soil core. The mean soil density of the 10 cores from each plot is given in the following table. Grazing Regimen Soil Denisty (g/cm3) Continuous grazing 2.05 3.05 3.12 1.59 3.83 1.53 1.44 Three-week grazing, one-week no grazing 1.20 1.48 3.54 1.03 1.45 1.40 2.68…
- A physician wants to test if temperature has an effect on heart rate. In order to do this, she compares the heart rate in beats per minute of several random volunteers after a period of time in a room with a temperature of 50∘F and after a period of time in a room with a temperature of 75∘F. Suppose that data were collected for a random sample of 11 volunteers, where each difference is calculated by subtracting the heart rate in beats per minute in the 50∘F room from the heart rate in beats per minute in the 75∘F room. Assume that the populations are normally distributed. The test statistic is t≈5.627, α=0.05, the corresponding rejection regions are t<−2.228 and t>2.228, the null hypothesis is H0:μd=0, and the alternative hypothesis is Ha:μd≠0. Which of the following statements are accurate for this hypothesis test in order to evaluate the claim that the true mean difference between the heart rate in the 75∘F room and the heart rate in the 50∘F room is significantly not equal to…Exercise 2.250 introduces a study showing thatfluoride exposure might have long-term negativeconsequences for the offspring of pregnant women.Part of the study examines the effect of adding flu-oride to tap water on mean fluoride concentrationin women. Summary statistics for fluoride concen-tration (measured in mg/L) for the two groups are given in Table 6.17. Find and interpret a 99% con-fidence interval for the mean increase in fluorideconcentration for those with fluoridated tap water. Answer the above questions in picture. Tap water Sample size mean St.Dev --------------- --------------- -------- ------ Fluoridated : 141 0.69 0.42 non-fluoridated 228 0.40 0.27A physician wants to test if temperature has an effect on heart rate. In order to do this, she compares the heart rates in beats per minute of several random volunteers after a period of time in a room with a temperature of 50∘F and after a period of time in a room with a temperature of 75∘F. Suppose that data were collected for a random sample of 11 volunteers, where each difference is calculated by subtracting the heart rate in beats per minute in the 50∘F room from the heart rate in beats per minute in the 75∘F room. Assume that the populations are normally distributed. The physician uses the alternative hypothesis Ha:μd≠0. Suppose the test statistic t is computed as t≈5.627, which has 10 degrees of freedom. What range contains the p-value?
- For 5.20, can you provide PH Stat path for calculating this?After testing 40 participants, a significant x2obt of 13.31 was obtained. With a .05 and df 2, how would this result be reported in a publication In your own words please not copied from the interneta sample of 4 students was taken and information about daily pocket money in tl (Y) and spending in tl (x) was collected