How do you identify the relationship between two variables in a scatter plot?

Write the properties of Arithmetic mean Calculate the mean values of \( x \) and \( y \) for the following regression equations \( 8 x-10 y+66=0,40 x \quad 18 y=214 \) Write the normal equation of a second degree parabola Determine the spearman's rank correlation coeflicient for the following data \( n=9 \) and \( \sum d^{2}=176 \) List out the types of index numbers. 7. Determine the unweighted aggregates price index for the following data: \( \sum P_{1}=757 \) and \( \sum P_{0}=522 \) 5. What is cost of living index number? 6. Write down the formula for Time reversal and Factor reversal test.

1. Числовые характеристики.

2. Эмпирическая функция распределения.

In which of the following case is the level of significance divided into two tails equally. \( \begin{array}{lll}\text { (a) A manufacturer claims that his } & \text { (b) A milk bottling plant is expected to } \\ \text { products last for more than } 24 \text { hours. } & \text { fill } 250 \mathrm{ml} \text { of liquid in one bottle. } \\ \text { (c) A manufacturer claims that defects in } & \text { (d) A school claims that their passing } \\ \text { its production are less than } 5 \% & & \text { ratio is } 75 \% \text { or more }\end{array} \)

If a scatter plot shows points that are closely clustered together, what can you infer about the correlation between the variables?