In a survey of 200 boys, of which 75 were intelligent, 40 had educated fathers; while 85 of the unintelligent boys had uneducated fathers. Do these figures support the hypothesis that educated fathers have intelligent boys ? Use x-test, valus of x tor 1 degree of freedom at 5% level is 3.84.

Q: Two groups of students reported mean weights of 162 kgs and 148 kgs respectively. When would the…

A:

Q: It was determined that the percentage of a's in the English language in the 1800s was 9%. A random…

A: It is given that the population proportion; p is 9% (=0.09). In the survey, it is found that 66 of…

Q: 4. 3,539 participants attended the seventh examination of the Offspring in the Fram- ingham Heart…

A: The random variable systolic blood pressure is normally distributed. There are two samples which are…

Q: A study found the lengths of daily driving time for people in your district are Normally distributed…

A: The mean is 35 minutes and the standard deviation is 3.

Q: A random sample of n = 4 scores is obtained from a normal population with ? = 20 and ? = 4. What is…

A:

Q: When interpreting F (10, 29) = 4.78, p > 0.05, how many subjects were tested in this simple one-way…

A: The F-statistic is a ratio of two sample variances, and it is commonly used in hypothesis testing to…

Q: A sample of 100 individuals has a mean depression score of  20 with an SD of 2. What is the standard…

A: The formula for calculating the standard error of the sample is,

Q: A sample of n=5 scores has a mean of x=9. what is Ex for this sample?

A: Mean = 9 n = 5

Q: Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100 and standard…

Q: An airline company is interested in improving customer satisfaction rate from the 80% currently…

A: Step 1: Set Up the Hypotheses- **Null Hypothesis (H0):** The customer satisfaction rate is 80% or…

Q: An analysis was conducted to determine whether the average height of the 25 girls in the same class…

A: To test whether the average height of 25 girls is different from the general population of 15-year…

Q: Do wearable devices that monitor diet and physical activity help people lose weight? Researchers had…

A: Sample size n = 237Sample mean x¯ = -3.5Sample standard deviation s = 7.8We have given the…

Q: A tire manufacturer has a 60,000 mile warranty for tread life. The company wants to make sure the…

A: Solution: Given information: n= 250 Sample size of tires x=64500 miles Sample meanμ=60000 miles…

Q: A survey in Brighton among cancer patients revealed that 62 out of 454 women patients are diagnosed…

A: Solution: Let X1 be the number of women patients are diagnosed with lung cancer, X2 be the number of…

Q: A research study examined the effects of a new drug versus an old drug on hypertension. There were…

A: The objective of this question is to determine if there is a significant difference in the…

Q: A sample of n = 5 scores has a mean of X-bar = 9. What is ∑X for this sample?

A: From the provided information, Sample size (n) = 5 Mean (x̅) = 9

Q: A random sample of n1 = 300 voters registered in the state of California showed that 143 voted in…

A: Given: Sample sizes: Number of voters in California n1=300 Number of voters in Colorado n2=216…

Q: Evans conducted a study to determine if the frequency and characteristics of pediatric problems in…

A: The question does not provide details about the study,sample size , proportion of population…

Q: he scores of adults on an IQ test are approximately Normal with mean 100 and standard deviation 15.…

A:

Q: The U.S. Department of Energy reported that 51.7% of homes were heated by natural gas. A random…

A: Given X=115 n=221

Q: A doctor wants to estimate the mean trigliceride level of all 20- to 29-year-old females (in…

A: Given data  Margin of error (E) = 3  95% ci for μ. S = 17.1 n = ?

Q: A researcher hypothesizes that the SUNY professors have a higher job satisfaction level than the…

A: State the hypotheses. That is, the population mean of the overall job satisfaction equals 28. That…

Q: Do female college students spend more time thán male college students watching TV? This was one of…

A: Given: For males: MeanXmales¯=68.3Standard deviationsmales=67.5n1: no. of male students surveyed=46…

Q: The heart rate of humans are normally distributed with a mean of 90.3 bpm and std. dev. of 7.3 bpm.…

A:

Q: Two separate samples, each with 16 individuals, receive two different treatments. After treatment,…

A: The pooled variance is, Thus, the pooled variance is 13.333.

Q: Before every flight, the pilot must verify that the total weight of the load is less than the…

A: Let "M" be the mean weight of the passengers.

Q: Left tail test with Zcalc = -2.26. What is the p-value of the test?

A: The test statistic value is zcalc=-2.26, and the test is left tail.

Q: A statistics teacher taught a large introductory statistics class, with 500 students having enrolled…

A: The given claim is that the smaller class was more effective and the students perfume better than…

Q: You're a researcher and you study narcolepsy. Narcolepsy is a condition characterized by bouts of…

A: Given:

Q: Determine the test score of John in Statistics if he has a z-score of 1.9. (SD = 4, mean = 85)

A: Given that in statistics, John has z-score of 1.9 where mean score is 85 and SD is 4. Here, to find…

Q: The effectiveness of surgery for weight loss reported here found that "The surgery was associated…

A: The difference between initial weight and the final weight is determined for each subjects.

Q: Before every​ flight, the pilot must verify that the total weight of the load is less than the…

A: We have to find probability of overloading.

Q: State whether the z-score locates the raw score x within a sample or within a population…

A: Solution: Given data ×=50,        s=5, x̄ =40  To find: Whether the z-score locates the raw score x…

Q: F-statistic

A: f test statistics F = the mean square between groupsmean square within groups…

Q: A clinical study was conducted on a medicine and the data obtained as follows: calculate Sensitivity…

A: It is given that: For "Diseased":True Positive= 1000True Negative= 50For  "Non-Diseased": True…