A random sample of 25 electric lamps found to have an average life of 533 hours, with a standard deviation of 22 hours. Is there any indication, from the sample to believe that the average length of life of electric lamps of the same brand is less than 550 hours, while the standard deviation is more than 20 hours.

Q: A professor in the women’s studies program believes that the amount of smoking by women has…

A: Given a professor believes that the amount of smoking by women has increased in recent years. 2…

Q: Does it take a different amount of time for seeds to germinate if they are near rock music that is…

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

Q: According to the historical data, the life expectancy in the United Kingdom is less than or equal to…

A: Given that,mean(x)=78.2standard deviation , s.d1=5.5number(n1)=235mean(y)=76.6standard deviation,…

Q: The IQ (intelligence quotients) of 35 master's students from wealthy backgrounds is, on average, 107…

A: Given Information: n1=35n2=34s12=10s22=8μ1=107μ2=112α=0.05

Q: The score for a standardized reading test are found to be normally distributed with a mean of 300…

A: The area under continuous distribution curve represents the proportion of data. So the area between…

Q: A bakery owner is trying out new donut recipes that have less fat. The current recipe have an…

A: Given: Mean of current recipe is μ=175 grams. Sample size of donut baked is n = 12. Mean of new…

Q: According to the historical data, the life expectancy in Belgium is less than the life expectancy in…

A: Given that, Sample size of individuals from Belgium n1=220 Sample size of individuals from US n2=205…

Q: The time required to complete a school achievement test was found to be normally distributed, with a…

A:

Q: A life time of a certain brand of tires is approximately normally distributed with a mean of 42,500…

A: Given data, μ=42500σ=3200P(X>x)=0.881-P(Z<z)=0.88P(Z<z)=0.12P(Z<-1.175)=0.12z=-1.175

Q: According to the historical data, the life expectancy in the United States is less than or equal to…

A: Since you have posted a question with multiple sub-parts we will answer the first three sub-parts…

Q: According to the historical data, the life expectancy in France is less than the life expectancy in…

A: According to historical data, the 240 individuals lived a mean of 78.2 years with standard deviation…

Q: A marine biologist claims that the mean length of mature female pink seaperch is different in fall…

A: Given: Fall Sample size (n1) = 12 Sample mean x¯1=123 Sample standard deviation (s1) = 14 Winter…

Q: A pediatrician claimed that the average time for a drug to take effect is. 15 minutes with a…

A:

Q: The IQs of 600 applicants of a certain college are approximately normally distributed with a mean of…

A: Given : The IQs of 600 applicants of a certain college are approximately normally distributed with a…

Q: An experiment was conducted to a sample of nine gold fish and ten clown fish to determine if there…

A: In case of single population parameter comparison with a specific value, known population standard…

Q: The score for an IQ test is approximately normal with a mean of 100 with standard deviation 15. An…

A: here AS PER GUIDELINES I HAVE CALCULATED  1st main QUESTION , PLZ REPOST FOR REMAINING   HERE ,…

Q: marine biologist claims that the mean length of mature female pink seaperch is different in fall and…

A: Solution: Given information: n1= 12 Sample size of falln2= 10 Sample size of winter x1= 123  Sample…

Q: In 2005, a random sample of 100 recorded deaths in the United States showed an average life span of…

A: Given data: Sample size  = 100 Sample mean  = 71.8 Population mean  = 70 Let assume,  significance…

Q: Researchers conducted a study to investigate whether there is a difference in mean PEAK EXPIRATORY…

A: Solution:From the given information, asthma kids sample size is 100, sample mean is 290 and standard…

Q: According to the historical data, the life expectancy in Egypt is equal to the life expectancy in…

A: Let us consider population 1 as Egypt and population 2 as Morocco.

Q: A random survey of 85 death row inmates revealed that the mean length of time on death row is 17.8…

A: Answer: From the given data, Sample size (n) = 85 Sample mean x = 17.8 years Sample standard…

Q: According to the historical data, the life expectancy in Germany is less than the life expectancy in…

A:

Q: A large national study conducted in 2004 found that the mean systolic blood pressure for males aged…

A: From the provided information, Sample size (n) = 200 Sample mean (x̅) = 136 Standard deviation (s) =…

Q: The amount of money spent on online foods by customers at an online restaurant follows a normal…

A:

Q: ck music that is continuously playing compared to being ar classical music? The 54 seeds that were…

A: Given The 54 seeds that were exposed to rock music took an average of 30 days to germinate. The…

Q: he blood platelet counts of a group of women have a bell-shaped distribution with a mean of 253.8…

A: Given data,Mean μ=253.8sd    σ=61.7P(68.7<X<438.9)=?

Q: According to a recent study, if a person smoked, the average number of cigarettes smoked per day was…

A:

Q: a dataset with a mean of 60 and a standard deviation of 8, how many observations are expected to…

A: The mean of a dataset is The standard deviation is The data is considered to follow normal…

Q: A certain type of cable has a mean breaking point of 146 pounds with a standard deviation of 6…

A:

Q: A marine biologist claims that the mean length of mature female pink seaperch is different in fall…

A: Here , 2 sample t test ( Equal variances) is applicable

Q: Suppose that that the average BMI of the patients at Beth Israel Deaconness Medical Center is 30…

A:

Q: Does it take a different amount of time for seeds to germinate if they are near rock music that is…

A:

Q: Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the…

A:

Q: A random sample of 46 adult coyotes in a region of northern Minnesota showed the average age to be…

A: The given sample size is 46, sample mean is 2.03, and sample standard deviation is 0.79. The…

Q: Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the…

A:

Q: Lake Quanipaug in Connecticut is famous for its yellow perch. Studies have found that the national…

A: Here, the level of significance, α = .02. H0: µ =8.2 inches (That is, the true average length of the…

Q: The average height of 20 students in a class is 160 cm with a standard deviation of 10 cm. If a new…

A: Answer: To find the new average height, we first calculate the sum of heights of the existing…

Q: Find the standard deviation of these battery lifetimes, if 90% of these batteries do not achieve a…

A: Here given ,  The lifetimes of a certain brand of battery are assumed to be normally distributed…

Q: A manufacturer of calculator batrries claims that the mean length of life for its battry is 500…

A:

Q: A simple random sample of birth weights of 29 girls has a standard deviation of 829.5 hectograms.…

A: Given information: Sample size n=29 Sample standard deviation s=829.5 Population standard deviation…

Q: a. For this study, we should use Select an answer b. The null and alternative hypotheses would be:…

A: Here AS PER POLICY I HAVE CALCULATED FIRST 3 SUBPART PLZ REPOST FOR REMAINING PARTS

Q: The lengths of a particular animal's pregnancies are approximately normally distributed, with mean =…

A:

Q: The winner for Best Male Actor is 35 years old and winn3er for Best Female Actress is 47.  The mean…

A: The z-score for male actor is, z=x-μσ=35-45.15.9=-10.15.9=-1.71 The z-score for male actor is -1.71.…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.