If the correlation coefficient is negative, this means the test statistic, t, can not be calculated O the slope of the regression line is negative O the regression line can be used for prediction there is a strong correlation between the variables ) the calculation was done wrong O there is no correlation between the variables

Q: A professor wants to evaluate whether testing students weekly with a quiz improves their learning of…

A: A professor wants to evaluate whether testing students weekly with a quiz improves their learning of…

Q: to a pet owner. Dogs were categorized as small, medium, or large. Costs were calculated as the aver…

A: Given: The calculated F statistic was 421.58

Q: (i) (ii) (iii) Construct a histogram Construct a polygon Compute the mean, mode, median and standard…

A: i) Histogram: ii) Frequency polygon:

Q: 9.30 Let Y1, Y2, ..., Y, be independent random variables, each with probability density function…

A:

Q: Assume the sample is representative of the entire population. For a person selected at random,…

A: Given that  New diagnostic test for the condition are shown.   Condition ispresent Condition is…

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A:

Q: Within the nexXt two years. An inexpensive suppressor, which would provide protection for only one…

A: here given, The owner of a small firm has just purchased a personal computer, which she expects will…

Q: b) How many three-digit phone prefixes are possible in which no digit appears more than once in each…

A: a) How many are three-digit phone prefixes that are used to represent a particular geographic area…

Q: A college entrance exam company determined that a score of 25 on the mathematics portion of the exam…

A: The hypothesized mean is 25.

Q: According to a report, the standard deviation of monthly cell phone bills was $5.23 three years ago.…

A: Given that  A report the standard deviation of monthly cell phone bills was $5.23 σ=$5.23

Q: 25. Suppose X is a random variable distributed with mean u and standard deviation a > 0. If the…

A:

Q: Exercise 2. In a study of memory processes animals were presented with a one-trial avoidance task.…

A:

Q: Based on this matrix calculate the false positive rate.

A: in confusion matrix  1 = positive  0 = negative

Q: 5. The average cell phone lifespan, according to a new research, is 24.3 months. It takes 2.6 months…

A:

Q: Compute the following (a) C6, 2 (b) C7, 7

A:

Q: 1. The data shown in the table represent the measurements of 10-kl resistors (in k) produced from…

A:

Q: A certain type of electronic component has a lifetime Y (in hours) with probability density function…

A: The pdf of lifetime Y (in hours) is given by fy|θ=1θ2 ye-yθ,         y>0 Let Y1, Y2, ...., Yn be…

Q: Let X1, X2, ..., X, be a random sample from a population r.v. X, with range Rx c [a, b).…

A: Given information: X1, X2,....,Xn are random sample selected from the population random variable X…

Q: Suppose you roll two dice. d) What is the probability the sum is 8? e) What is the probability that…

A: 2 dice thrown Number of possible outcome Number of Possible outcome=62=36

Q: School year 2019-2020 in Cabancalan National High School, 6 days were allotted for the enrolment of…

A: The following information has been given: Day Number of students(X) Monday 19 Tuesday 10…

Q: Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 44 of the…

A: There are two independent samples which are treatment group and placebo. We have to test whether…

Q: Q104. How many years did you attend school, not including years spent in infant and basic school?

A: Given that, Let X be the random variable denotes the number of hours worked by female   The variable…

Q: A decade-old study found that the proportion of high school seniors who felt that "getting rich" was…

A: Given that  p=72%=0.72 Null hypothesis=H0  , Alternate hypothesis=H1

Q: Answer the following questions about probability and statistics. A. What is P(X = 5) when X ~…

A: Given that.   X~N( 5 ,25 )     X~N( 0 , 1 )   μ=0  , ?=1 (for standard normal distribution)…

Q: The next seven questions refer to the following scenario: A random sample of 16 Porsche drivers…

A: From the provided information, it is obtained that: For Porsche Drivers:n1=16, x¯1=50, s12=9For…

Q: This graph is from a study evaluating an opioid drug and gender on pain levels. Which of the…

A: Interaction effect means the effect of one independent variable on the other dependent variable…

Q: Assume that a simple random sample has been selected from a normally distributed population and test…

A: Claim : sample is from a population with a mean less than 1000 hic.

Q: 4. A sociologist discovered that an average of 7.2 jobs was held by 50 retired men during the course…

A: Sample mean x̄=7.2,n=sample size=50, population standard deviations σ=2.1  Construct 95% CI for…

Q: 1.3. Do the data suggest that the two methods provide the same mean shear strength? Use α = 0.1.…

A: P value is grater than the level of significance  We fail to reject the null hypothesis There is no…

Q: What's the probability that you made a Type I error? There is no Type I Error Half a percent OA…

A: Given Information: BMI of a five year old girl is 15.  That is, the hypothesized value of population…

Q: According to a food website, the mean consumption of popcorn annually by Americans is 63 quarts. The…

A:

Q: A vending machine is designed to dispense a mean of 7.8 oz of coffee into an​ 8-oz cup. If the…

A: Let X be the random variable from Normal distribution with mean (μ) = 7.8 and standard deviation (σ)…

Q: Suppose a researcher is testing the hypothesis Hn: p= 0.6 versus H,: p<0.6 and she finds the P-value…

A: Given : P-value = 0.28

Q: Calculate the probability (as a percent) of the following 7-card hand: AAABBCC (three cards of the…

A: Let us suppose there are three marbles viz. a red, a green and a blue. From these, there are three…

Q: In a survey, 10 people were asked how much they spent on their child's last birthday gift. The…

A: Solution-: Given: n=10, x ¯=46, s=14, c=0.98 We find, Point estimate =? Margin of error=?

Q: Assume that a sample is used to estimate a population mean μμ. Find the margin of error M.E. that…

A: Margin of error is given by M.E. = za*standard deviation/√n Hwre standard deviation= 8.9  Sample…

Q: Express the confidence interval (465.3, 675.5) in the form of i± ME. * + ME =

A: We have given that  The confidence interval is (465.3, 675.5)

Q: The number of constraints in each of the following hypotheses is (1) B1 + B2 = B3 = Ba B1 B2 (ii) =…

A: Given Information: Consider the given hypotheses:     i β1+β2=β3=β4ii β1β2=β3 and β4=1iii β1=1 and…

Q: Table of Standard Normal Probabilities for Negative Z-scores Table of Standard Normal Probabilities…

A:

Q: Find the median for the data items in the given frequency distribution. Score, x Frequency, f 1 4 5…

A: We have given the following data  to find the median .  Median is the middle  number in  a,…

Q: The scores on a test are normally distributed with a mean of 110 and a standard deviation of 22.…

A: Let X be the random variable from Normal distribution with mean (μ) = 110 and standard deviation (σ)…

Q: Find the area of the shaded region under the standard normal distribution to the left of the given…

A:

Q: Consumer Reports rated airlines and found that 90% of the flights involved in the study arrived on…

A: Given n=212 P=0.90

Q: We know that the wage distribution in the US is not normally distributed. It is closer to a pareto…

A: Given that, We randomly sample (n) 1286 high school students in California. The sample average is…

Q: 1) what is the sampling method in this senario? All private school teachers in Regions I, IV, and X…

A: Given :

Q: In a classification setting the primary objective should always be to achieve the lowest possible…

A: To categorization any experiment, our goal is always be to achieve the lowest possible error rate or…

Q: uppose that a pair of dice is tossed. One die has 8 sides the other has 5 sides. What is the…

A: The number of dice is 2.

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: Use the display of data to find the standard deviation (do not round until the final answer, then…

A:

Q: Determine the t-value in each of the cases. | Click the icon to view the table of areas under the…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…