A famous welfare association in Karachi claims that it takes 9 minutes on average to reach its destination in emergency situations. To test this claim, the agency which licences ambulance services had them timed on 50 emergency calls, getting a mean of 10.4 minutes with a standard deviation of 2 minutes. At the 5% significance level test the claim that the average time the ambulance takes to reach its destination is 9 minutes.

Q: A village head wants to know the number of chickens in his area. So the Lurah conducted research on…

A: Given data : sample size, n =36 sample mean, x̄ = 4.7 sample standard deviation,s=…

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 103 and a standard deviation…

A:

Q: Suppose that the amount of time per day that American adults spend on their mobile devices is…

A: Let X denotes the amount of time (in minutes) per day that American adults spend on their mobile…

Q: Activity trackers are electronic devices that people wear to record physical activity. Researchers…

A: Given Information:  Sample size (n) = 61  Mean value (x) = 9797 steps Standard deviation = 2313…

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation…

A:

Q: university in England and each student in a random sample of 38 female students from the same…

A: The following information has been provided: For Males : Sample Mean 1 (Xˉ1)(\bar X_1)= 282282…

Q: To determine whether a new drug designed to lower a person’s heart rate is effective or not, Dr.…

A: Since sample size is large and population standard deviation is known, z-test is appropriate in this…

Q: An article in the Podunk County Times claims that children in the county watch an average of 3 hours…

A: a) The hypotheses for the test are given below. Null hypothesis: H0: µ = 3 Alternative hypothesis:…

Q: 95 students who struggle in math classes at a large university were selected to participate in a…

A: Given: n1  = 49 n2  = 46 x1 bar = 83.1 x2 bar = 79.2 s1 = 5.2 s2 =  8.2

Q: accounting examination is 26, how large a sample is needed to estimate the true mean score within 6…

A: HERE GIVEN , n = ??? population standard deviation  =  26  confidence level  = 99%

Q: The height of men is a normally distributed variable with a mean of 68 inches and a standard…

A: Mean(μ)=68Standard deviation(σ)=3

Q: If the average wait time is 12 minutes with a standard deviation of 3 minutes, determine the…

A: Given : Average wait time =12 minutes Standard deviation =3 minutes We have to calculate percentage…

Q: According to a news program, Americans take an average of 4.9 days off per because of illness. The…

A: The p-value is a conditional probability of getting a test statistic as extreme or more extreme than…

Q: The average cholesterol level for women in the United States is 209.4 mg/dl (milligrams per…

A: Let X: The cholesterol level for women in the United States. We know, X be normally distributed…

Q: Jina recently switched her primary doctor to one specializing in caring for elderly patients. On her…

A:

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 101 and a standard deviation…

A: Given that Population mean=101 Standard deviation =14 Using the empirical rule, what percentage of…

Q: The Australian government would like to assess the impact of employment in different sectors on the…

A: Given that 13 men employed in the public sector   and 6 men employed in private sector are surveyed.

Q: A test had 12 items. A new version of a test was made by adding a set of 12 items which resembles…

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

Q: based on this graph, would the median be greater than the mean? or the mean gretaer than the median?…

A: Here data is negatively(right) skewedmore data at higher end

Q: scores are used as part of the admissions process for more than 60006000 graduate management…

A: *1 As Given:-   The null and alternative hypotheses are ?0:?=563 versus ??:?<563.…

Q: he University of Sydney conducted a survey to find out the average number of hours an academic…

A: Given information- Population standard deviation, σ = 2 hours Confidence interval = 0.95…

Q: Men hoping to have children are encouraged to avoid hot tubs or saunas because heating the scrotum…

A:

Q: What is the type of test you will use? (z-test, single-sample t-test, paired-samples t-test, or…

A: to find A). What is the type of test you will use? (z-test, single-sample t-test, paired-samples…

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: 20% of drivers don't use turn signals, observed of 140 cars.  What is the standard deviation of…

A: Given that 20% of drivers don't turn signals and there are 140 cars. That is, p=0.20 and n=140

Q: A government board examination has a mean score of 500 points. A review school promises improved…

A: Let μ denotes the population mean score. The government board examination has a mean score of 500…

Q: The scores on the Law School Admissions Test (LSAT) are normally distributed with a mean of 150 and…

A: Determine the lowest LSAT test score that an applicant would have to have to make this cutoff.   The…

Q: The Fair Isaac Corporation (FICO) credit score is used by banks and other lenders to determine…

A: The hypothesized mean is 720.

Q: 72 students who struggle in math classes at a large university were selected to participate in a…

A:

Q: Using 1% level of significance, test if the population average is not 73.

A: A normally distributed standardized English test is known to have a mean score of 73 and a standard…

Q: If the sample size (n) and probability of success (p) are given, which equations are used to…

A: 1) Given,Sample size = n (fixed)Probability of success = p (for each trial).So, probability of…

Q: An advertising agency that serves a job radio station wants to estimate the mean amount of time that…

A: Here, σ=45, confidence level=90%, E=5.

Q: The Fair Isaac Corporation (FICO) credit score is used by banks and other lenders to determine…

A: Solution: Let µ be the mean FICO score of the population. Let X be the FICO score. From the given…

Q: A phormaceubcal testing company wants to test a new cholesterol drug. The mean cholesterol level of…

A: Z = (x-mean)/standard deviation  Mean = 245  Standard deviation = 35

Q: According to a leasing firm's reports, the mean number of miles driven annually in its leased cars…

A: a)   Denote μ as the population mean number of miles driven annually under the new contracts.

Q: According to Facebook, the mean number of community pages, groups and events that users are…

A: Given that  Sample size n=64 Sample mean=86 Sample standard deviation =48

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 101 and a standard deviation…

A: According to the given information in this question We need to apply empirical rule

Q: When the manager performed a significance test, the P-value was 0.07. What is the meaning of this…

A: P-value is defined as the probability of getting the difference at least as extreme as we are…