At ? = 0.10, can it be concluded that there is a difference in means of hours spent for studying between male and female based on point estimate in second attached image? Assume the population variances are unequal

Lake Quanipaug in Connecticut is famous for its yellow perch. Studies have found that the national mean length is µ = 8.2 inches. However, a random sample of 31 fish caught during Memorial weekend at Lake Quanipaug, had a sample mean of  x̄=7.1 inches, with an estimated sample standard deviation of s = 3.8 inches. Do these current data indicate that the average length of the yellow caught at Lake Quanipaug is less than historical µ = 8.2 inches? Use α = .02. State α, Ho, H1, p-value, rejection, or non-rejection, and be certain to interpret your results.

Based on the scatter plot above, describe the relationship between the amount of cost damage and the distance from nearest fire station to the residential.    Determine the regression line for the above regression output.    Interpret the slope coefficient of distance to the nearest station affecting the amount of fire cost damage.    Compute the correlation coefficient and interpret its meaning.    Does the distance to the nearest fire station has significant influence on the cost damage amount? Conduct a test at 1% significance level. ]   Predict the fire cost damage generated if the distance from nearest fire station is 2.5 kilometers. Is this estimate reliable? Explain. []

An investigation of the relationship between traffic flow (measured in cars per day) and lead content (measured in micrograms per gram of dry weight) in the bark of trees near the highway yielded the following summary statistics:   Sample Mean Sample Standard Deviation Lead Content (micrograms per gram dry weight) y¯=y¯= 680 sysy = 240 Traffic Flow (cars / day) x¯=x¯= 1750 sxsx = 800 The correlation between lead content and traffic flow was found to be r = 0.6 and a scatterplot showed the form to be linear. The least squares regression line for using X to predict Y was found to be y^=365+0.18xy^=365+0.18x.   Which one of the following is a proper interpretation of the slope? Group of answer choices For each 1 car per day increase in traffic flow, we predict an corresponding increase of 0.18 in lead content of surrounding trees For each 0.6 car per day increase in traffic flow, we predict an corresponding increase of 365.18 in lead content of surrounding trees For each 1…

In a study by WebCriteria, it took an average of 2.1 minutes to locate information and buy products on the Delta Airlines website, compared to an average of 2.7 minutes on the British Airways site. Assuming normal populations with equal standard deviations, data from sheet 3 contains the times (in minutes) required during visits to the two websites. In a suitable one-tail test at the 0.01 level, was the mean time for the Delta visits significantly less than that for the British Airway visits?   Sheet 3 Delta            British 2,12               2,44 1,40               2,51 2,03               2,48 2,00                2,88 2,34                2,60 1,63                 2,38 1,96                 2,77 3,36                2,96 1,69                2,82 2,01                2,45 1,86                3,29 2,08                3,05 2,61                 2,03 1,62                 3,18 1,67                 2,65 2,17                 2,94 2,69                3,31 2,34                 2,93 2,25…

The mean and standard deviation of a series of 100 items were found to be 60 and 10 respectively. While calculating, two items were wrongly taken as 5 and 45 instead of 30 and 20. Calculate corrected variance, standard deviation and coefficient of variation.

Birth weight at a local hospital for the past year had a normal distribution with a mean of 106 ounces and a variance of 36 ounces2. If the middle 50% of the birth weights are considered to have a normal birth weight then what is the birthweight that defines a high birthweight baby (above normal)?

a residual is the distance between the data value in the line of best fit true or false?

The results of a common standardized test used in psychology research is designed so that the population mean is 105 and the standard devlation is 30. A subject earns a score of 108. What is the Z-score for this raw score? Z-Score =

draw 2 normal curves with the same mean and different standard deviations